[Python-modules-team] why did hypercorn migrate to testing?

[peter green]

At the start of the month python-asynctest and hypercorn were removed from
testing due to a rc bug in python-asynctest and the fact that hypercorn
build-depends on python3-asynctest (which is built from the python-asynctest
source package).

However hypercorn just migrated to testing again, despite the fact that
python-asynctest is rc buggy and not in testing. This leaves hypercorn
in violation of "packages must be buildable within the same release".

Any idea why this happened?