If you try to fetch Polyraptor with Forerunner of the Empire, it will often not put any card into your hand.
Yes, polyraptor is bugged. Uncage managerie, rites or reason/pull ignore him. However gather the pack doesn’t.
I don’t think it’s ignoring him I think it is exiling him from the game. I never DRAW polyraptor after I mass cast growing rites, commune with dinosaurs. And I tried putting dark petition in and he isn’t going to the graveyard