config_import issue with layout builder for partial split for removed component.

This is thrown by \Drupal\layout_builder\SectionComponent::getPluginId(). Looks like invalid configuration indeed.

This would greatly benefit from a failing test. Or the very least a much better issue description with actual config examples that would help to debug this.

In particular I would like to have a scenario where I can attach xdebug and check what $type, $path and other variables are for the components. Because it seems like it keeps the component empty, but components is a sequence. and for sequences it shouldn't keep the empty array. But this is something that would be much easier to debug with a test that creates this scenario.

Main File - core.entity_form_display.node.contact.default.yml

uuid: ac517f68-8985-4fd5-a77b-c69996313b99
langcode: en
status: true
dependencies:
  config:
    - entity_browser.browser.media_entity_browser
    - field.field.node.contact.field_add_skills
    - field.field.node.contact.field_back_url
    - field.field.node.contact.field_cmp_bio
    - field.field.node.contact.field_cmp_company
    - field.field.node.contact.field_cmp_email
    - field.field.node.contact.field_cmp_full_name
    - field.field.node.contact.field_cmp_image
    - field.field.node.contact.field_cmp_job_position
    - field.field.node.contact.field_cmp_job_title
    - field.field.node.contact.field_cmp_phone_number
    - field.field.node.contact.field_contact_description
    - field.field.node.contact.field_content_group
    - field.field.node.contact.field_content_owner
    - field.field.node.contact.field_eyebrow
    - field.field.node.contact.field_linkedin_url
    - field.field.node.contact.field_meta_tags
    - field.field.node.contact.field_parent_categories
    - field.field.node.contact.field_requires_full_bio_page
    - field.field.node.contact.field_search_tags
    - field.field.node.contact.field_yoast_seo
    - field.field.node.contact.layout_builder__layout
    - node.type.contact
  module:
    - advanced_text_formatter
    - entity_browser
    - field_group
    - layout_builder_at
    - link
    - maxlength
    - metatag
    - path
    - telephone
    - text
    - yoast_seo
third_party_settings:
  field_group:
    group_general:
      children:
        - field_cmp_full_name
        - field_cmp_company
        - field_cmp_job_position
        - field_cmp_job_title
        - field_cmp_email
        - field_cmp_phone_number
        - field_eyebrow
        - field_parent_categories
        - field_requires_full_bio_page
        - field_contact_description
        - field_cmp_bio
        - field_linkedin_url
      label: GENERAL
      region: content
      parent_name: ''
      weight: 0
      format_type: details
      format_settings:
        classes: ''
        id: ''
        open: false
        description: ''
        required_fields: true
    group_skills:
      children:
        - field_add_skills
      label: SKILLS
      region: content
      parent_name: ''
      weight: 1
      format_type: tab
      format_settings:
        classes: ''
        id: ''
        formatter: closed
        description: ''
        required_fields: true
    group_c:
      children:
        - field_content_owner
        - field_content_group
        - field_search_tags
      label: 'Content & Search Tags'
      region: content
      parent_name: ''
      weight: 9
      format_type: details
      format_settings:
        classes: ''
        id: ''
        open: false
        description: ''
        required_fields: true
id: node.contact.default
targetEntityType: node
bundle: contact
mode: default
content:
  field_add_skills:
    type: string_textfield
    weight: 2
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_back_url:
    type: link_default
    weight: 8
    region: content
    settings:
      placeholder_url: ''
      placeholder_title: ''
    third_party_settings: {  }
  field_cmp_bio:
    type: text_textarea
    weight: 11
    region: content
    settings:
      rows: 5
      placeholder: ''
    third_party_settings:
      maxlength:
        maxlength_js: null
        maxlength_js_label: 'Content limited to @limit characters, remaining: <strong>@remaining</strong>'
        maxlength_js_enforce: false
        maxlength_js_truncate_html: false
      advanced_text_formatter:
        show_token_tree: 0
  field_cmp_company:
    type: string_textfield
    weight: 2
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_cmp_email:
    type: email_default
    weight: 5
    region: content
    settings:
      placeholder: ''
      size: 60
    third_party_settings: {  }
  field_cmp_full_name:
    type: string_textfield
    weight: 1
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_cmp_image:
    type: entity_browser_entity_reference
    weight: 2
    region: content
    settings:
      entity_browser: media_entity_browser
      field_widget_display: rendered_entity
      field_widget_edit: false
      field_widget_remove: true
      field_widget_replace: false
      open: true
      field_widget_display_settings:
        view_mode: thumbnail
      selection_mode: selection_append
    third_party_settings: {  }
  field_cmp_job_position:
    type: options_select
    weight: 3
    region: content
    settings: {  }
    third_party_settings: {  }
  field_cmp_job_title:
    type: string_textfield
    weight: 4
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_cmp_phone_number:
    type: telephone_default
    weight: 6
    region: content
    settings:
      placeholder: ''
    third_party_settings: {  }
  field_contact_description:
    type: string_textarea
    weight: 10
    region: content
    settings:
      rows: 5
      placeholder: ''
    third_party_settings:
      maxlength:
        maxlength_js: 280
        maxlength_js_label: 'Content limited to @limit characters, remaining: <strong>@remaining</strong>'
        maxlength_js_enforce: false
        maxlength_js_truncate_html: false
      advanced_text_formatter:
        show_token_tree: 0
  field_content_group:
    type: options_select
    weight: 17
    region: content
    settings: {  }
    third_party_settings: {  }
  field_content_owner:
    type: options_select
    weight: 16
    region: content
    settings: {  }
    third_party_settings: {  }
  field_eyebrow:
    type: string_textfield
    weight: 7
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_linkedin_url:
    type: string_textfield
    weight: 12
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_meta_tags:
    type: metatag_firehose
    weight: 3
    region: content
    settings:
      sidebar: true
      use_details: true
    third_party_settings: {  }
  field_parent_categories:
    type: entity_reference_autocomplete
    weight: 8
    region: content
    settings:
      match_operator: CONTAINS
      match_limit: 10
      size: 60
      placeholder: ''
    third_party_settings: {  }
  field_requires_full_bio_page:
    type: boolean_checkbox
    weight: 9
    region: content
    settings:
      display_label: true
    third_party_settings: {  }
  field_search_tags:
    type: options_select
    weight: 18
    region: content
    settings: {  }
    third_party_settings: {  }
  field_yoast_seo:
    type: yoast_seo_widget
    weight: 4
    region: content
    settings:
      body: field_cmp_bio
    third_party_settings: {  }
  langcode:
    type: language_select
    weight: 10
    region: content
    settings:
      include_locked: true
    third_party_settings: {  }
  layout_builder__layout:
    type: layout_builder_at_copy
    weight: 12
    region: content
    settings:
      appearance: checked_hidden
    third_party_settings: {  }
  path:
    type: path
    weight: 6
    region: content
    settings: {  }
    third_party_settings: {  }
  simple_sitemap:
    weight: 11
    region: content
    settings: {  }
    third_party_settings: {  }
  status:
    type: boolean_checkbox
    weight: 7
    region: content
    settings:
      display_label: true
    third_party_settings: {  }
  title:
    type: string_textfield
    weight: 14
    region: content
    settings:
      size: 60
      placeholder: ''
    third_party_settings: {  }
  translation:
    weight: 13
    region: content
    settings: {  }
    third_party_settings: {  }
  url_redirects:
    weight: 5
    region: content
    settings: {  }
    third_party_settings: {  }
hidden:
  created: true
  promote: true
  sticky: true
  uid: true

Partial Split - config_split.patch.core.entity_view_display.node.contact.default.yml

adding:
  third_party_settings:
    layout_builder:
      sections:
        -
          components:
            1fa7cda7-a090-4444-8833-968765e7d412:
              weight: 0
            10cfe71b-b66a-4c87-928b-8ff5d439f577:
              weight: 1
            2a51bd12-a1fb-4499-8683-9a4d80dfb960:
              weight: 3
            45980bef-0f4f-45d5-ae77-3560c94798c5:
              uuid: 45980bef-0f4f-45d5-ae77-3560c94798c5
              region: second
              configuration:
                id: 'field_block:node:contact:field_cmp_email'
                label: Email
                label_display: '0'
                provider: layout_builder
                context_mapping:
                  entity: layout_builder.entity
                  view_mode: view_mode
                formatter:
                  type: email_mailto
                  label: hidden
                  settings: {  }
                  third_party_settings: {  }
              weight: 2
              additional: {  }
    layout_builder_restrictions:
      entity_view_mode_restriction:
        allowed_blocks:
          'BH Blocks': {  }
          Content:
            - 'entity_field:node:field_cmp_bio'
            - 'entity_field:node:field_cmp_full_name'
            - 'entity_field:node:field_cmp_image'
            - 'entity_field:node:field_cmp_job_title'
          'Content fields':
            - 'field_block:node:contact:field_cmp_email'
          'Custom block types': {  }
          'Custom blocks':
            - 'block_content:1c15f22e-4ec9-4971-9738-589599ff2771'
            - 'block_content:d7041f90-28f2-423d-82fd-8d18c2bdda57'
          Devel: {  }
          'Entity Browser':
            - 'entity_browser_block:breakout_banner_browser'
          Forms: {  }
          Help: {  }
          'Inline blocks': {  }
          'Lists (Views)': {  }
          Menus: {  }
          'Responsive Preview': {  }
          System: {  }
          User: {  }
          'User fields': {  }
          core: {  }
  hidden:
    field_add_skills: true
    field_back_url: true
    field_contact_description: true
    field_eyebrow: true
    field_linkedin_url: true
    field_parent_categories: true
    field_requires_full_bio_page: true
    field_search_tags: true
removing:
  dependencies:
    config:
      - field.field.node.contact.field_add_skills
      - field.field.node.contact.field_back_url
      - field.field.node.contact.field_contact_description
      - field.field.node.contact.field_content_group
      - field.field.node.contact.field_content_owner
      - field.field.node.contact.field_eyebrow
      - field.field.node.contact.field_linkedin_url
      - field.field.node.contact.field_parent_categories
      - field.field.node.contact.field_requires_full_bio_page
      - field.field.node.contact.field_search_tags
    module:
      - link
  third_party_settings:
    layout_builder:
      sections:
        -
          layout_settings:
            context_mapping: {  }
          components:
            1fa7cda7-a090-4444-8833-968765e7d412:
              weight: -10
            10cfe71b-b66a-4c87-928b-8ff5d439f577:
              weight: -8
            2a51bd12-a1fb-4499-8683-9a4d80dfb960:
              weight: -7
            f04740cc-289e-44ba-b04e-0311c3c82660:
              uuid: f04740cc-289e-44ba-b04e-0311c3c82660
              region: first
              configuration:
                id: 'field_block:node:contact:field_add_skills'
                label_display: '0'
                context_mapping:
                  entity: layout_builder.entity
                formatter:
                  type: string
                  label: above
                  settings:
                    link_to_entity: false
                  third_party_settings: {  }
              weight: 1
              additional: {  }
            5885bd10-a18a-4a62-93e7-3ebbb67a055b:
              uuid: 5885bd10-a18a-4a62-93e7-3ebbb67a055b
              region: first
              configuration:
                id: 'field_block:node:contact:field_search_tags'
                label_display: '0'
                context_mapping:
                  entity: layout_builder.entity
                formatter:
                  type: entity_reference_label
                  label: above
                  settings:
                    link: true
                  third_party_settings: {  }
              weight: 2
              additional: {  }
            083e1cfe-6c12-4cfb-977e-6d142fe35d7a:
              uuid: 083e1cfe-6c12-4cfb-977e-6d142fe35d7a
              region: second
              configuration:
                id: 'field_block:node:contact:field_linkedin_url'
                label: 'LinkedIn Url'
                label_display: '0'
                provider: layout_builder
                context_mapping:
                  entity: layout_builder.entity
                  view_mode: view_mode
                formatter:
                  type: string
                  label: above
                  settings:
                    link_to_entity: false
                  third_party_settings: {  }
              weight: -9
              additional: {  }
    layout_builder_restrictions:
      entity_view_mode_restriction:
        restricted_categories: {  }
      allowed_block_categories: {  }
  content:
    field_add_skills:
      type: string
      label: above
      settings:
        link_to_entity: false
      third_party_settings: {  }
      weight: 14
      region: first
    field_back_url:
      type: link
      label: above
      settings:
        trim_length: 80
        url_only: false
        url_plain: false
        rel: ''
        target: ''
      third_party_settings: {  }
      weight: 12
      region: first
    field_contact_description:
      type: basic_string
      label: above
      settings: {  }
      third_party_settings: {  }
      weight: 10
      region: first
    field_eyebrow:
      type: string
      label: above
      settings:
        link_to_entity: false
      third_party_settings: {  }
      weight: 11
      region: first
    field_linkedin_url:
      type: string
      label: above
      settings:
        link_to_entity: false
      third_party_settings: {  }
      weight: 16
      region: first
    field_parent_categories:
      type: entity_reference_label
      label: above
      settings:
        link: true
      third_party_settings: {  }
      weight: 13
      region: first
    field_requires_full_bio_page:
      type: boolean
      label: above
      settings:
        format: default
        format_custom_false: ''
        format_custom_true: ''
      third_party_settings: {  }
      weight: 9
      region: first
    field_search_tags:
      type: entity_reference_label
      label: above
      settings:
        link: true
      third_party_settings: {  }
      weight: 15
      region: first
  hidden:
    search_api_excerpt: true

I would appreciate a failing test to debiug this and come up with a solution.
Or if you can not create a scenario in a test, please re-create this problem with the demo umami profile and paste here the whole split config which produces this issue.

1. Install demo umami on the latest version of Drupal core
2. install Config Split
3. Create a split which behaves like the problem described in this issue.
4. Attach the split config to a comment
5. Describe in the comment what actions lead to the problem
   (for example:
   1. export the config
   2. turn split off
   3. import config without split
   4. turn split on again
   5. import config with the split

   )

6. If you need to do anything else for this problem to manifest, please describe that too.