I've noticed a few things:
-The aforementioned theming/Nautilus issues in Budgie
-Global Menu applet no longer works
-Logging in while having an internet connection adds another 20 seconds or so to my boot time. Typically I see a cursor, then bam desktop instantly. After last update, I see only my wallpaper for about 20 seconds before I reach the desktop. Disabling wifi fixes this.
-Setting wallpaper from nautilus no longer works
-Gnome-based right click menus broken, they appear "in pieces" at the bottom
-This journalctl error: systemd[943]: Failed to start BAMF Application Matcher Framework.
Regarding Global Menu:
After the latest update the Global Menu applet (available in the repos under Budgie extras section) does not work as intended. This menu shown in screenshot is all I see no matter which window is in focus.
I know this is a third party applet but I know of many others that use it on Solus so I can't be the only one. I could not find the developer to submit an issue so hopefully this finds them.
Before this issue, there was another that started years ago, where selecting "use bold application name" option in Budgie Panel settings caused the entry all the way to the right to become bold instead of the application name to the left. I settled with just disabling the bold option but the issue persists years later.
But now, this issue is a real problem because I have no menu bar in certain applications for example GIMP. Typically, using Global Menu sends the menu bar seen in the program itself up top in the panel. Removing Global Menu from the panel doesn't bring the menu bar back until I log back in. Plus, removing Global Menu then adding it again in panel options, causes all Budgie related windows to freeze for like a good 30 seconds. I think Budgie and GNOME are just not getting along lately, idk.
I'm bringing this up because Global Menu was sort of the icing on the cake for my desktop. Without it there's an ugly blank space in my top bar and make the UI I have set up weirdly.
In case it helps narrow down I'll detail how I have my desktop configured. Basically a docked icon task list on the left, and a global menu on the top panel the the left, with the system tray icons and clock to the right. So basically MacOS knockoff made using Budgie applets. Kept the same defaults and settings from since Plata was default theme. Switched from Pulse to Pipewire so I actually have sound. But everything else vanilla, no tweaks.
(I made this post initially because I saw Global Menu didn't work (hense why it was the focus of most of this post) but while working it out I ran into the several other issues that are listed above. My head hurts now and I am wary for the stability my desktop..)