Mmm really a weird bug that we didn't encounter during development, I'll definitely check it out, thanks for the help!
About the harp, if you play it from the long coords towards the shorter ones like in this clip, you'll shoot a note. The note makes more damage than the arrow.
https://youtube.com/clip/Ugkx5GovJoViA8EzM-92Es9W_pKS-9z14Iac?si=k4M9UhLUwET1hUe...