When I am brushin on a mask, the option to switch between black and white stops working and I can only brush in or out.

I am experiencing the same problem. Photoshop Beta v28.0.1. It seems to have started on this update, so my plan is to revert to a previous version until it can be fixed

To add to the original complaint, you can sometimes get the problem to correct itself, however as I experience the issue it becomes harder and harder to fix on its own. First, I switched to a different tool (adjustment brush tool) and upon switching back, that fixed it. Then the next time the problem happened, this fix did not work. Switching to the pencil fixed it. Then, then next time this happened, neither the adjustment brush or pencil fixed this. It’s almost as if it’s a virus affecting the tools

The issue will occasionally persist through saving and reloading the file in the same open instance of Photoshop. It can also persist upon closing and reopening the program. The problem occurs when switching between black and white in the raster mask layer (I use the X keyboard shortcut to swap foreground and background colors). It’s happening very frequently for me and masking is unfortunately an incredibly important part of my job so it’s affecting quite a bit of my workflow