P: 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.

Photoshop version: 28.0.1 20261014.m.3714 ae936ff, x64 (beta, PublicBeta)
Operating system: macOS 15.7.7
Hardware: Intel Mac, 16 GB RAM, Intel Iris Plus Graphics 655

Issue:
When switching between a layer's image thumbnail and its mask thumbnail, the foreground/background color state does not update correctly between color editing and grayscale mask editing.

During mask editing, color selection sometimes becomes unresponsive. I cannot select white or another grayscale value for painting on the mask.

Expected result:
Switching between layer content and its mask should update the color state correctly. I should be able to select white, black, or any intermediate gray value and paint on the mask using the Brush Tool.

Actual result:
The color state does not switch correctly, and sometimes I cannot change the painting color while the mask is selected.

Frequency:
The color-selection freeze occurs intermittently. I have not yet identified a reliable sequence that triggers it.

Workaround:
Switch to the Pencil Tool and change the color with that tool active. This allows me to change the color again.