The copper golem is supposed to spawn with certain wear to it depending on the type of copper block you use to spawn it. However, if you place the carved pumpkin on one of the sides of the block instead of on top as intended, the golem will be at the first stage, rather than whatever oxidized stage the block used was.
To recreate bug:
*Use any form of copper block that has a stage of wear to it, like Oxidized, for example.
*Place carved pumpkin next to the copper block instead of on top of it.
Duplicate of MCPE-223754