That's another totally weird thing about the client.. How can it possibly use a block as a head? Makes me wonder if the regular helmets are actually also place-able blocks :/ Or it's just a silly easter egg they put in. Either way the client is still weird.
You should try doing this with entity blocks, such as chests or the enchantment table thing
You should try doing this with entity blocks, such as chests or the enchantment table thing