Thanks for your reply, really appreciated! Don't know why it didn't strike me to try, but I built the develop branch and the issue went away.

Private tracker torrents work fine, but e.g. the Ubuntu torrent gets stuck at "Downloading 0.00%" with the following errors: tracker_announce_alert: ubuntu-20.04.2-live-server-amd64.iso (https://torrent.ubuntu.com/announce) sending announce (started) tracker_error_alert: ubuntu-20.04.2-liv...