A recent update made it so Cannon shots will detonate after 3 seconds, in case they get stuck on thing, however, other arcing projectiles can still get stuck in certain objects such as ponds or lily pads.
This affects Wilbur's poop, Silly Monkey Balls, unlit coconades, coconut projectiles from Floaty Boaty Knights and Palm Treeguards.
Steps to Reproduce
Get a projectile stuck on top of something.
This issue has been fixed in either a future version or updated in a previous version.