OK, try the following in a Transient buffer:

- Search for something using C-s - Exit isearch by moving the point (e.g. C-n) - Is the transient buffer still usable for you? In my case it becomes just a text buffer and all the shortcuts just got mapped to self-insert-command.

Dayum, given Transient's prickliness (I always feel like I'm walking on eggshells when I'm in it) I've never dared to C-s. But I tried this, and yeah, the transient reverts to a plain text buffer, and you're left in the lurch.