it work in 1.21.5 but not in 1.21.4

So i'm remaking some gem from the Bliss SMP and while translating my pack to 1.21.4 the effect that given if the player has a certain gem in offhand stop working, now if a player put 1 of the custom gem they get all the effect even though they ain't holding all of them in offhand, I do not know how to fix it any idea ?