There are a no thumbnails for videos or link previews visible on tchncs since the update / maintenance.
Thumbnails of links posted before the update are visible, but aren’t working for links posted after the update.
Can confirm, I have the same issue. Using an account from an instance not updated yet I can see everything normally.
milan@discuss.tchncs.de 3 weeks ago
a few hrs ago it was discovered that the image service silently did not properly start up, it should be corrected now. sorry about that