Does anybody know why and when thumbnails for YouTube videos are shown or not? It appears to depend on the lemmy instance the posts are served from:

Without Thumbnails

• https://lemmy.world/c/guildwars2@lemmy.wtf
• https://lemmy.wtf/c/guildwars2

With Thumbnails

• https://feddit.de/c/guildwars2@lemmy.wtf
• https://lemm.ee/c/guildwars2@lemmy.wtf

Update: It's not only YT thumbnails which aren't shown. This is your post about the free 24 slot bag as shown on lemmy.wtf (without thumbnail), lemmy.world (without thumbnail) and feddit.de (with thumbnail):

• https://lemmy.wtf/post/452
• https://lemmy.world/post/78622
• https://feddit.de/post/809185