Youtube thumbnail fails to show up on Topic List for e.g. Fakebook theme, TLP plugin.
Post a youtube video, switch to Fakebook Theme, no thumbnail appears.
Rebuild the post and the thumbnail appears, however, given users are expecting the thumbnail to appear imminently without staff intervention, this is not a great solution.
Topic.image_url appears to be
This seems to have broken recently, after beginning of August … I think this worked before August the 5th (but not sure when it actually broke). I’ve noticed this aligns roughly with a new version of Onebox …
I tested this on a prior build and the issue was not present, ruling out Youtube og responses I hope. Also Fakebook theme shows the same behaviour as TLP plugin, ruling out TLP plugin, so I do suspect it’s a recent regression in Discourse or Onebox.
This is a real issue for users of Topic List Previews.