I have run into the same problem too and I'd like to hear an answer.

I can confirm the same issue on iOS 26 beta 6. We have been using simultaneousGesture() as a workaround for the well-known bug, which is the same one BAR115 mentioned earlier. However, this workaround appears to be broken as well. At the moment, it seems there is no reliable way to use buttons inside sheets. This is just ridiculous.