Using Radicale after 3.1.9 returns multiple events for a search

python-caldav 1.6.0 fails and I've created a minimal test case
https://gist.github.com/lbt/01b5932d80bc1c87eccd0695fe4189f8

This currently returns 11 events for a recurring event.

git bisect shows the problem appears to have been introduced in 513e04e

commit by @metallerok

python-caldav now has a workaround so 2.0.1 works again:
python-caldav/caldav#439
python-caldav/caldav@6f0bd41