Long grass sprite changes when destroyed

When double tall grass or any other 2-block-high plant is broken at the base of the plant (bottom block), the sprite of the top of it changes to a Peony for a split second before disappearing. However, if the plant is broken by the top block no glitch occurs.

Attached is a .MP4 video of the glitch taking place, plus a log file (don't see anything in it)