Suddenly "image_url" : null in category JSON files

Support
1

Hi everyone,
I’m trying to solve an issue with missing images.

What’s the problem

  • We have a category with posts that contain video URLs (PeerTube instance).
  • The JSON contained "image_url" : ....
  • We switched to another PeerTube instance and replaced all the old URLs in the posts with the new ones.
  • The preview is shown, and everything looks okay; however, in the category JSON file → "image_url" : null.

What I’ve tried

  • I went through the settings
  • I searched online and also here; however, I found nothing useful for our case (also old - May 2020; this happened suddenly, so I suspect it’s on our side)
  • rebuild html for posts didn’t help either

Questions

  • How does Discourse actually extract thumbnails from these services? From what I’ve been able to find, it should be automatic.
  • Are there any settings I missed?
  • Do we have to do something on the PeerTube instance (is there some setting like “allow thumbnail scraping” or something like this? IDK PeerTube, just spitballing here)

Info

  • I have admin access to the forum
  • Discourse 3.5.0.beta4-dev
  • We are using Cloudflare

Thank you for any help or pointers you can give me.

3

That’s my guess.