Federation with communities on other instances

Yesterday I made a post in the football community located on lemmy.world (https://lemmy.world/c/football). Now when you look at the post from here discuss.tchncs.de/c/football@lemmy.world it has 0 comments and 1 upvote:

https://discuss.tchncs.de/post/183785

Whereas it actually has 1 comment and 4 upvotes on the Remote instance:

https://lemmy.world/post/343210

Because on discuss.tchncs.de the comment doesn’t show up, I obviously get no notification nor can I respond.
Anyone got an idea?