Thank you, Daniel.
Changing back the status of the topic, just in case.
Apparently, yes, if no one else have this issue.
OK, I got the answer. This is not a new feature, but a local bug. Thanks, Mika!
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?