I’ve noticed some glitches and I haven’t done the upgrade. Color brush tool mostly, when traveling under another layer leaves blocky gaps in the upper layer. They go away if you click off the tool. Not sure whre that’s coming from.
I’ve also noticed that now you pretty much need to be logged in to Adobe for the software to work properly at all. That didn’t use to be the case. You could use it disconnected from the internet until recently (I found that out the last time power went out at the house. I had a generator, but no internet.)
But remember too, Photoshop on a Mac is Adobe’s M1 test subject. It is being rebuilt to run on the M1 or with Rosetta or some such silliness. I would expect all kinds of crap from the software unless they port dual versions, which I doubt but have not researched. I have less and less patience every day for software shenanigans. They need to nuke their entire line and start over.