🇮🇳India @akki123

In the end, it boils down to my custom theme hook implementation.
customTheme_preprocess_block__BlockID()
I removed that and update.php works.

In my case, removing this file bootstrap/templates/block/block.html.twig
resolved the update.php issue.

filter_settings.filter_insert_block:
  type: filter
  label: 'Insert Block Filter'
  mapping:
    check_roles:
      type: boolean
      label: 'Check roles permissions'

Should be like this in config/schema/insert_block.schema.yml