Leaves of trees generated in a very old save (presumeably Alpha) don't decay and don't drop saplings or apples when punched. Leaves generated more recently do decay and do drop items.

Leaves of trees generated in a very old save (presumeably Alpha) don't decay and don't drop saplings or apples when punched. Leaves generated more recently do decay and do drop items.

What I expected to happen was...:
Leaves decay when the wood is removed and drop items when punched

What actually happened was...:
Leaves float in the air long after the wood is gone and when punched they yield no items.