When I clock into an item with a dangling clock, the "Resolving Idle Time" menu pops up. When I then press an option with a capital letter, however, I end up clocked-in, in the identical state as the lowercase option. On my machine this does not happen when resolving idle times, only when clocking in from a dangling clock.
Also present with 'make vanilla'. Emacs : GNU Emacs 29.4 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0) of 2024-06-25 Package: Org mode version 9.8-pre (release_9.7.7-106-g114c76 @ /home/rens/Projects/org/org-mode/lisp/) -- Best, Rens