Hi all - I have been successfully using the new AI masking for some time, however I have suddenly found that the "add" and "subtract" buttons have disappeared. Screen shots below. Any ideas how to remedy this?
I had this happen to me recently too. When I exited out of the mask panel and then returned, the add and subtract buttons came back. Have you tried this? If that doesn't fix it, what happens if you quit Lightroom Classic and then reopen it?
Your second screenshot shows three collapsed masks. The buttons only show when the mask is expanded, so you see the components that make up the mask. Clicking on it once more, or double clicking may be all you need to do next time.