In emacs-version 28.2, I'm observing my comint managed processes getting into a state when C-l is just doing nothing when it would have previously moved the cursor to the bottom of the window and showed me the maximal amount. Normally C-l cycles through three positions, but when my process gets into this state, it goes through top, middle, "do nothing (stay in middle)", and then back to top to repeat the cycle.
I'm trying to reproduce the problem with a minimal example, but am keen to hear if there's anything obvious I should look into. I did not see this behaviour with emacs 27 (and earlier).
M-x report-emacs-bug. – Drew Oct 14 '22 at 17:14