Priest Zombie villager(pink) into Librarian Villager(white) when cured

i found a bug priest(pink robe) zombie villager throw weakness potion then golden apple to zombie villager wait few minutes then will into villager librarian(white) when crued the robe look not same as zombie villager

In Pocket Editon Minecraft is just fine when librarian zombie villager into librarian villager when cured but not PC