Grown Melon and pumpkin stems become growing state 0 when updating to 1.2.13

Steps to Reproduce:

Create a world in 1.2.11 and allow melon and pumpkin stems to fully grow

Observed Results: When updating they all become lowest growing state again (like they've just been planted)

Expected Results:They stay fully grown

Notes: These melons here were filled using /fill command however it seems to do the same to all from what I've seen.