In the course of dropping python3.7 from supported versions binNMUs were scheduled before the python3-defaults update dropping python3.7 migrated to testing.
These binNMUs migrated to Testing immediately. This resulted in a case where in Testing, python3.7 and python3.8 were supported versions, but packages had lost their python3.7 support. This caused autopkgtest failures which appeared as regressions. In the future, I think it would be better to upload python3-defaults dropping the old version, let it migrate to Testing, and then schedule binNMUs. That would result in less churn. This is sent to more than one list, so please pay attention to which list you are replying. Scott K P. S. I am not subscribed to debian-release, so please cc me on any replies for that list.
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