Quick summary

Status: Work around in place, issue is being left open while root cause is addressed

There seems to be a bug in the site editor when editing a Header or Footer template part where you see Pattern Placeholder block, and you can’t edit.

This has been reported so far on simple sites, and on a range of themes.

Workaround: editing the template from the Page Editor works as expected.

Tasks

• Stop triggering the GB bug: Don't add post types to patterns #79238
• Open a PR in GB to fix the issue @arthur791004 Edit Site: Fix the pattern with the post types becomes the placeholder pattern when editing template part WordPress/gutenberg#52503
• Revert Don't add post types to patterns #79238 once the GB fix has been deployed to dotcom

Steps to reproduce

1. Pick one of these themes: Appleton, jinjang, Barnett
2. Click to go to Site Editor
3. Go to template parts
4. Click to edit Header or Footer template parts

What you expected to happen

To edit the blocks that are part of the template part

What actually happened

Can't see blocks, so can't edit.

Impact

Some (< 50%)

Available workarounds?

Yes, easy to implement

Platform (Simple and/or Atomic)

Simple

Logs or notes

No response