I seam to have found an annoying bug when using face sets. Once in face set mode I target the vertex then I scale it .then if I forget to return the target to auto or group ,and use any of the tools , I can’t undo that last stroke .
Make sets
ISO color
Target vertex
Scale
Forget to return target
Use clay tool
Action can’t be undone
But when you return the target after using scale or any other transform . It seam to work proper
Working on a vid to show process