Editor Issue with Custom Fields and Metabox area

I just tested on a site with a lot of plugins and themes and it doesn’t happen. Can you check to make sure your site is properly loading all the JS and CSS? I have a feeling something’s not right there.

Thank you for answer.
I just deployed new installation and database on a new subdomain and see the same picture.

https://paste.pics/e263c23180a6b96e26d1fb8a2d4c2a17

But it’s just in Safari. In Chrome all these looks fine. So maybe it’s a cross-browser issue. Although everything looks good in Safari and WP 5.7.2. It’s weird, isn’t it?

I tested on Safari and it was fine. That’s really weird.

OK, I got the answer. This is not a new feature, but a local bug. Thanks, Mika!

I’m going to mark this resolved (what was the local bug?)

Apparently, yes, if no one else have this issue.

@goodwin_ It looks like this bug was reported, so others are experiencing it too:
https://github.com/WordPress/gutenberg/issues/33668

Thank you, Daniel.
Changing back the status of the topic, just in case.