Now you've elaborated, I do seem to remember quite a few people posting about #peertube - and #lemmy to a lesser extent.

I think there may be special issues with the way they use #ActivityPub but I hasten to add, I don't know the ins an outs of it well enough to say for sure.

It's interesting that #friendica works more or less perfectly though, despite being at least as complex as the others you mention.

I wonder if it's because it's far older, so everyone already knows how to allow for its quirks.

It's an interesting topic though - and obviously one I follow :)