Thanks for the quick fix! However, it's not clear to me if the fix will go to bullseye-security or at least bullseye-updates or only to testing. (Is there some way to find this out on the web site or so?)
I need to know because now I have to either wait for the bullseye package or backport it myself, and I'd like to avoid having to do both (and thus rebooting my systems twice). Frank