Comments Block: Default Avatar returning 404

[jordesign]

Description

When viewing the Comments block (in single post, or page templates) the default avatars are returning broken images. Viewing the console shows that the URL https://secure.gravatar.com/avatar/?d=mm&f=y&r=g&s=80 is returning a 404.

Step-by-step reproduction instructions

1. Open the Site Editor and view a single or page template which contains a Comments block.

Screenshots, screen recording, code snippet

Environment info

Wp 6.3 RC3
No plugins
TT3

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

[t-hamano]

I was able to reproduce the problem in the environment started with wp-env, although the URL is slightly different.

Edit: I was able to reproduce the avatar block by itself.

[t-hamano]

The fundamental problem may be that the avatarURL returned by the ueDefaultAvatar() hook is somehow inaccessible.

wp.data.select('core/block-editor').getSettings().__experimentalDiscussionSettings.avatarURL

[t-hamano]

I thought the problem might be related to the Gravatar endpoint and not the Gutenberg issue. Therefore, I have submitted a core ticket.

https://core.trac.wordpress.org/ticket/58970

[kraftbj]

Relayed to the Gravatar team and reported in their internal repo

[t-hamano]

Thank you, @kraftbj!

[kraftbj]

The fix has been deployed. Some caching may still interfere with some requests until it all flushes out.

Working example: https://secure.gravatar.com/avatar/?s=101&d=mm&f=y&r=g