It's most probably the immense load, I too had troubles finding a few communities on feddit.de that I knew existed on lemmy.ml, I had to try several times for them to show up.

I'm subscribed to them now but sometimes it's hard to see new posts or to comment.

It's a difficult situation, we're hugging all lemmy servers to death lol, we have to be patient and wait until things go back to normal, hopefully :D

My bet would be on technical issues with indexing or indexing speed maybe? I do get results from lemmy.ml on browse.feddit.de .

Could be politics. A lot of people are appearently upset about the owners political views, which I think is very silly myself.

Also it seems that Reddit users are brigading against the Lemmy network due to the opinions of the instance owner.

Its just so stupid, all of this. Why are people like this? Why do we demand everyone to think the same way and have similar opinions, or we feel like we need to go fight them?

Not quite sure, I'm only new here. The lemmy.ml list of federated instances does have feddit.de listed. And the feddit.de list of federated instances shows lemmy.ml also.

Not sure - could be because it's the 'official' one and not a community server.

I definitely found a bunch lemmy.ml communities there a week ago, so I wonder if it's just lemmy.ml struggling under the load now? browse.feddit.de depends on instances to report what they offer.