Whilst this is not a feature in previous versions, I do think it should be, but, it doesn't work on some leaves (blossom, cherry, etc).
I'll also suggest, if keeping this feature, to make it ignore player placed leaves (persistent), since it could make some building annoying.

This happened because it uses the block's map color to determine if it's a plant or not.
Can: Oak, Spruce, Birch, Jungle, Acacia, Dark Oak, Mangrove, (Flowering) Azalea, Ancient
Cannot: Cherry, All Blossom colors
I made it a block tag in my latest commit. It also checks for not-fully-grown crops and persistent leaves.