[Bug] Free enchantments using spawn eggs

[LadyHaley]

I found that it is possible to use excellent enchants with a mob spawn egg to get free enchantments on player crafted armor, I tried recreating it but I think its timing and RNG dependent. basically, I threw some unenchanted armor down on the ground, and then spawned a zombie on that spot with a spawn egg, which the zombie then equiped except it was now enchanted diamond armor, but only with the non vanilla enchantments. this doesnt occur 100% of the time, but it seems easy enough to replicate, especially with the thrifty enchant equiped