Killing a Jellyfish with a Boat Cannon will not leave a Dead Jellyfish in its place. Instead it will disappear completely leaving nothing.
Steps to Reproduce
Kill a Jellyfish with a Boat Cannon or Woodlegs' 'Sea Legs'.
Kill a Jellyfish with a Boat Cannon or Woodlegs' 'Sea Legs'.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.