[Gutenberg v13.7.0-rc.1] Site Editor returns 'The page requested does not exist'

[rw-ye]

Quick summary

While team testing for Gutenberg v13.7.0-rc.1, we discovered that opening the site editor with an FSE theme active on a simple site returns the error The page requested does not exist

Steps to reproduce

1. Open/create a simple site.
2. Activate an FSE theme from Appearance > Themes
3. Go to Appearance > Editor
4. The page returns a The page requested does not exist message.

What you expected to happen

I expected the site editor to load.

What actually happened

The site editor returned the message The page requested does not exist.

Context

Team Testing for Gutenberg v13.7.0-rc.1

Platform (Simple, Atomic, or both?)

Simple

Theme-specific issue?

FSE Themes

Browser, operating system and other notes

No response

Reproducibility

Consistent

Severity

Some (< 50%)

Available workarounds?

No response

Workaround details

No response

[chad1008]

Thanks @rw-ye! This is an interesting one... sandboxes (mine, at least) appear to be immune. I can't repro there (which is why I didn't catch it when smoke testing before the edge release), but I can reproduce it on a normal Simple site.

This will need some investigation, thanks again for the report!

[chad1008]

Haven't found any clues to the cause yet. There's one error in the console, and it's just a 500 error for https://chadnonedgetest.wordpress.com/wp-admin/themes.php?page=gutenberg-edit-site. There aren't any changes in the site editor URL with the new RC.

[Addison-Stavlo]

Im noticing on my test site that I am unable to visit the page editor was well in this state. 🤔

I noticed a PHP warning about gutenberg_enable_block_templates not being a function. Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'gutenberg_enable_block_templates' not found or invalid function name...

[fullofcaffeine]

I noticed a PHP warning about gutenberg_enable_block_templates not being a function. Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'gutenberg_enable_block_templates' not found or invalid function name...

Hi Addie 👋🏻, where did you see the warning?

[Addison-Stavlo]

Hi Addie 👋🏻, where did you see the warning?

when logging php errors on my sandbox from /tmp/php-errors

i was testing an unrelated diff here - D84305-code and my test site with edge enabled was having problems due to this issue.

[renata-franco]

📌 SCRUBBING

• Tested on Simple ✅

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📌 FINDINGS/SCREENSHOTS/VIDEO

I was able to replicate this issue on a Simple site with Attar theme.

1. For the testing with the correct version of Gutenberg, I used these instructions

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📌 ACTIONS

• Marked as Triaged for Quality Squad review

[daledupreez]

I believe this issue should be addressed by #65997 and/or Automattic/jetpack#25281, so I am going to close this issue out.