The problem seems to have gone away on its own, at least for the time being. I made no deliberate changes to installed software or startup items, so all I can think of is an update that incidentally resolved the issue. OS is still Sonoma 14.4.1, build 23E224, which dates back to early March (which is when the problem appeared, fwiw) so that's not where the fix came from. I have no idea if DB got a tweak in recent weeks.