When I try to sync the following repository, it throws an error (see below):

 Repository URL*: https://download.jitsi.org/stable/
 Repository Type*: deb
 Has Signed Metadata?: false

The errors are like this:
12:55:54 ERROR: Download failed: https://download.jitsi.org/stable/stable/jitsi-videobridge2_2.1-376-g9f12bfe2-1_all.deb - [Errno 14] HTTPS Error 404 - Not Found.
12:55:54     388/396 : jitsi-videobridge2_2.1-376-g9f12bfe2-1_all.deb (failed)

It seems to add a second "stable" to every file it tries to download.

While on the other hand this and some other repos (all type "deb") synced perfectly: https://packages.prosody.im/debian/dists/focal/main/binary-amd64/