Zombies lose some properties after converting to a drowned

When a zombie converts to a drowned, the following tags are reset:

• Invulnerable

• CanPickUpLoot

• CanBreakDoors

• LeftHanded

• ArmorItems and ArmorDropChances (might be intended)

• HandItems and HandDropChances (might be intended)

• ... and probably some others

NoAI is not affected. CustomName is not affected.