Projectiles in Spider Lair

Projectiles like Magic Bomb, Dagger Throw, and Rock Toss does not work in Spider Lair;

https://gyazo.com/7a20528e3d135b9bf65d3b8b31e0bc82

this man is speaking straight facts @berezaa you might want to check this out before boss fight?

EDIT WE REJOINED AND IT WORKED!

I also got this idk if this is about that but people arent showing up in that party on the side thing