@rmondello Yep

@rmondello I think it's because YouTube are serving the app their cookie banner instead of the video. Happens in other apps too.

Edit: I avoid using YouTube as much as possible. Does it disappear if you agree/reject their cookies (or already have for this session)?

@rmondello Youtube recently made a change and stopped serving the video pages when Mastodon (or other software, AFAIK) is requesting it, probably using some fingerprinting. Mastodon builds a link preview based on the page that is served, hence what you are seeing (in German because your server is probably located in a datacenter in Germany, or Youtube thinks it should see german language).
We tried to get in touch with people at Youtube, but no success so far.

@rmondello same generic german YT description now for some weeks for me in Ivory

@rmondello same. I assumed it was my pihole

@rmondello It's your mastodon instance that fetches the preview, and that is hosted in (or at least YouTube's geoip database thinks it is in) Germany.

@rmondello I'm probably going to get the details wrong, but I _think_ the issue is that your particular instance is hosted in Germany, and the server is grabbing the preview on behalf of the client.