@kat I think it happens if you don't follow them. Replies used to be broken if so, but not sure if @prologic ever fixed that. I used not to follow him, so that he would see the broken mentions, and feel shame (he didn't, he is shameless! LOL), but ever since the re-creation of my account I just decided to follow, so I don't know if the issue is fixed or not.

I know mentioning @xuudoesnm.p.psf.lt was broken too. Maybe still is? We'll see.