Template parts and synced patterns are undefined and can not be edited In the Site Editor when Gutenberg is active

[carolinan]

Description

When I use a block theme, and I have Gutenberg trunk active, (19.8.0-rc.1) template parts are undefined when I select the "Edit" option from the toolbar of the template part block.

Step-by-step reproduction instructions

Activate a block theme.
Activate Gutenberg trunk
Go to Appearance > Editor. Select a template to edit.
Locate or insert any template part in the template.
With the template part selected, locate and click on the "Edit" option in the block toolbar.

Expected result: The template part opens and shows the correct blocks without errors.
Actual result: The editor is blank except for a notification that says the template part may have been deleted.

The url is site-editor.php?p=%2Fwp_template_part%2Fundefined&canvas=edit&focusMode=true
Without Gutenberg active, it is site-editor.php?postId=ollie%2F%2Fheader&postType=wp_template_part&focusMode=true&canvas=edit

I expect the

Screenshots, screen recording, code snippet

template-part.mp4

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[carolinan]

@youknowriad I believe this is related to #67199.
If I checkout the commit that was made just before this, then there are no issues with editing the template part.

[carolinan]

I updated the title only, the same thing happens when you try to edit a synced pattern.
When I select the "Edit original" option in the toolbar, the URL is site-editor.php?p=%2Fwp_block%2Fundefined&canvas=edit&focusMode=true

[carolinan]

In the update to onNavigateToEntityRecord, the param is params.id

https://github.com/WordPress/gutenberg/pull/67199/files#diff-824e020152bb3af84d9532be963368df02d0cc4478dea9cd9192d0d8a2a135daR20

But when onNavigateToEntityRecord is used in the template part block and the synced patterns, it is named postId.

https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/block/edit.js#L212
https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/template-part/edit/index.js#L243

If you search the code base for onNavigateToEntityRecord there are a few more occurrences where it is named postId.