Update from 2.8 to 3.0-beta - issues with typography and patterns

Reusable blocks / Patterns issue should be solved by this 📌 Patterns and synced patterns (reusable blocks) Needs work

I'll take a look at the typography issues but note that font sizes definition location has changed. For example:

theme-support:
  __experimentalFeatures:
    typography:
      fontSizes:
        theme:
          - name: Small
            size: "0.8125em"
            slug: small
          - name: Medium
            size: "1em"
            slug: medium
          - name: Large
            size: "1.50em"
            slug: large
          - name: Extra Large
            size: "2em"
            slug: extra-large
          - name: Extra Extra Large
            size: "4em"
            slug: extra-extra-large

To enable dimensions you need to set the following configuration to theme's configuration file:

theme-support:
  __experimentalFeatures:
    spacing:
      margin: true
      padding: true
      units:
        - px
        - em
        - rem

I couldn't replicate the custom font size, at least with Olivero but make sure the option is enabled at:

theme-support:
  __experimentalFeatures:
    typography:
      customFontSize: true

I suggest to take a look at the configuration from the Starter theme: https://git.drupalcode.org/project/gutenberg_starter/-/blob/1.0.x/gutenb...
Still WIP but a good reference.

Btw, some configuration definitions have changed without a deprecation step because of the "long" jump we made regarding the core library. In future releases we will do better 😉