Using shears on leaves drops the leaf blocks as expected, but also drops saplings and fruit (vanilla apples, but in Biomes-O-Plenty you also get other fruit from their trees). I have verified this on an install containing only Forge 2088. This does not seem to happen when using a Silk Touch axe.
Searching the forums I only found a much older (1.6.2) similar bug here.
ETA: The leaf blocks can also be placed and re-sheared, with the same results.
ETA2: Now tested on Forge 2092