[MC-50996] Existing player heads only show the default Steve head

Place a head in a world of a previous Minecraft version (<14w11a)
/give <name> minecraft:skull 1 3 {SkullOwner:<name>}

Open this world in 14w11a, shows only Steve head.
You have to place the head again to see the correct player head.

Linked issues

i believe its: /give @p skull 1 3 {SkullOwner:"playername"}

It also works without the quotation marks.

This is fixed, but skulls already loaded with the latest snapshot will be forever broken (load a backup)

It seems skulls in the inventory still have the tag, as they don't stack. So just store up skulls you want in your inventory until the next snapshot.