Pumpkin and Melon stems seem to be missing the "connected" or "attached" variable/statement. it does not show up in F3 nor does it seem to be configured in the gamefiles beyond the model file

Breakdown:

melon_stem.json & pumpkin_stem.json Blockstate missing 'attached' variant/state (and/or game-code) stage 8 perhaps?

stem_fruit.json model file exists, but is not referenced/used anywhere.

melon_stem_attached.json & pumpkin_stem_attached.json model files do not exist.

F3 screen does not show an 'attached' blockstate.