Hi, It's apparently the same as Debian bug #1052172, caused by Debian backporting an untested patch that just made it to upstream's development branch and apparently hasn't received proper testing.
Upstream discussion begins at https://gitlab.gnome.org/GNOME/vte/-/issues/88#note_1849187 . Jeremy, I recommend you to revert that patch and hold it off until it gets fixed and receives a fair amount of testing. cheers, e.
