What on earth is this?

Opera One(version: 135.0.5973.133)
Opera is up to date
Update stream:Stable
System:Ubuntu Core 24 (x86_64; ubuntu:GNOME)
Chromium version:151.0.7922.176

Reddit is rendering like this:

Screenshot of how Opera is now rendering Reddit.

The same page looks fine in Firefox. I think I'm done.