Comment 19 for bug 1962807

could you install https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/2.24.32-4ubuntu4/+build/18229140/+files/libgail18-dbgsym_2.24.32-4ubuntu4_amd64.ddeb and get another backtrace?

you can also try downgrading gtk3 then, the backtrace has more details but the bug still doesn't really make sense

the fact that already started program keep working is expected since the library is loaded from disk on start and a change on disk isn't going to replace it until the program exit and starts again