Hello Lucas, I have seen this on my side as well, but it was inconsequential, probably because I still have Python2 installed, but of course, that is bad. The relevant code should be this:
BUILD_ONLY_PYTHON3 := $(shell [ `lsb_release -r -s | sed -e s/unstable/11/ -e s/testing/11/ -e s/buildd-// -e 's/\..*//'` -ge 11 ] && echo true) This is handling "unstable" only, and I am assuming Debian Sid changed to provide a "n/a" value there instead now. I will produce an upload later this coming week to address it. Yours, Kay