The Bug
Although players remove items via left-clicking, it shouldn't be thought as damaging the item frames and cancel it.
How to Reproduce
Place a item frame.
Insert a item into that item frame.
Change the invulnerable field to be true:
/data modify entity <item_frame> Invulnerable set value 1b
Try to remove the item.
It doesn't affect insertion and rotation.
Code Analysis
This was due to the lack of further detection (decompiled 1.20.2 using vanilla mapping):
net.minecraft.world.entity.decoration.ItemFrame.class
public boolean hurt(DamageSource $$0, float $$1) {
...
if (isInvulnerableTo($$0)) return false;
...
}
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