Control-b (back-one-character) not working in notes

(Apologies if this is addressed elsewhere. I searched the forum and the FAQs, but didn’t find anything.)

When typing in the Notes for a paper, I have all my expected hotkeys (ctrl-f forward, ctrl-a beginning, ctrl-e end), except for control-b (back-one).

All the other text entry areas in paperpile that I’ve tested behave as expected.