Check "season of the void brethren"

I think it's bugged. Maybe we shouldn't be seeing them, or maybe servoskulls still drop keys, or who knows.

I'll keep playing and maybe find out, haha.

I just started playing again, after years...never did any seasonal content, and didn't select a pirate based season.

Hopefully, someone still plays or cares about this game. 

If I figure it out, I'll try to remember to come back here and post what I find.