Yes, I have the same issue with Photoshop on Big Sur + Mac Mini M1 + the newest iPad Air 10,9". My artboard is chopped into 2 or 4 pieces, it's unusable 😕
So I've found some solution although it's far from perfect. I'm not sure if it's worth the hassle. If you go to Preferences > Performance and uncheck "Use Graphics Processor" it resolves the issue, but then the Photoshop performance will drop drastically.
Adobe please fix this issue.
Just tried the same - but seems that it doesn´n have any effect on my divice - instead the low-performance... Hope Adobe will fix this... !!
I just installed the newest Photoshop 22.2 update. Sidecar on iPad is still not working on Photoshop... It's working without any problems on apps from one of the Adobe competitors, so it's not a problem with a Big Sur OS.
Is there anyone here from Adobe reading this?! It's March already, two PS updates later and we still can't use iPad Air 2020 as a graphic tablet with Photoshop on a Mac as a secondary display. It's working perfectly fine with any other app from your competition. That's just sad that you can't fix this issue for so long crippling our workflow.
Same here - it's really annoying and frustrating...
Adobe`s bugs at the moment are the worst I´ve seen during my abo-seasons since 2013...
I feel you. I was forced to switch from Design Premium CS6 to CC subscription this year after upgrading my old Mac to M1 and Big Sur. This is a very bad Adobe CC experience so far. Photoshop still has issues like the one from the topic, Illustrator was crashing almost every 20-30 min in the first weeks after the upgrading to CC (until I switched off GPU acceleration in the Preferences). I feel like I'm forced to use beta versions of apps yet have to pay for it much more than before... and nobody from Adobe seems to care or even acknowledge those bugs. Are they even reading these threads?
BTW. It's not even an Apple fault. For example, Affinity apps run great. Adobe want's us all to switch or what?