When you kill a goriya while another Goriya's boomerang is out, the other goriya's boomerang dissapears.
Goriya I.C. Weiner
I can confirm this in b584.
Still exists, latest beta. It is confirmed.
What happens in the NES ROM? We're not fixing NES compatibility problems at this time, but that doesn't mean we should introduce new ones...
I'm reasonably sure the boomerangs of other Goriya's don't dissapear in the NES game.
EDIT: Well I don't have my NES right now but I just tested this with a ROM and they didn't dissapear...If you want to trust a ROM...
Very well. Fixed in the next build.