With the 2021 upgrade, I can't use any of the Ps tools while my Wacom Intuos Pro connected to my laptop. The selected tool is constantly changing into the "move" tool. There's no way to drop it, I have to restart Photoshop every time this happens. I've seen others, too, have similar problems with Wacom Intuos and the 2021 update. Please fix this, this is quite urgent for me.
May be a PS issue with Mac OS. I do not see a problem using windows 10 and PP 2021 with pen support. You should report the issue to Adobe at https://feedback.photoshop.com/ I do have several issues with PS 2021 though so I use PS 2020 version 21.2.6