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Any entities that extend
TameableEntityorAbstractHorseEntityworks. -
To jump to the else branch that performs the lookup:
HandItems[0].tag.OwnerUUIDmust not beTAG_String.HandItems[0].tag.OwnerUUIDandHandItems[0].tag.Ownermust be assigned to the entity together.
String uuid;
if (tag.containsKey("OwnerUUID", TAG_String) /* This method returns false if an actual tag type is different from the specified type */) {
uuid = tag.getString("OwnerUUID");