VanillaBackport causes non-stacking items on Forge 1.20.1 due to unintentionally added NBT data.

[CelestialAbyss]

ItsBlackGear/VanillaBackport#185

Player reported this issue when collecting Sugar Cane that was naturally generated from the world, but the issue seems to not be easily reproduceable. Has also happened when obtaining Bread from a structure.