Short update: After almost a week Customer Support told me they won't help with Linux "due to the high level of user customisation and configurability", but referred me to the Developer Support team.
There they actually helped and provided a fix. It sounded like there should be an official update to the driver some time soon, but they didn't say a date.
Pinned Comments
goldensuneur commented on 2020-03-02 19:00 (UTC)
I finally had time to investigate the issue. It looks like that as of 11.5, the
DesktopVideoHelper.service
has to be running for the capture card to work properly.