The Bug:

Big dripleaves powered with redstone are able to tilt when hit with a projectile.

Steps to Reproduce:

• Place down a big dripleaf.
• Place a redstone block adjacent to it.
• Attempt to make the big dripleaf tilt by standing on top of it.
• →  Notice how it doesn't tilt.
• Throw a projectile at the big dripleaf.
• →  Notice how it tilts despite being powered with redstone.