Before:

After removing the dragon:

The water was also not removed. I used //drain so I could take screen shots.

Also notice there is one barrier block missing in the pattern. This is due to an incorrect "if" condition created for placing a water block, which causes another issue where water spills out and all over the place. I'll open a separate issue for that.

Since I disabled the WingFixer stuff in newer versions, thanks to your comments in issue #67, this fix shouldn't be necessary anymore. Of course, some older versions will still have the problem, but most of the servers will use CB/Spigot 1.13+. If the WingFixer stuff really isn't needed anymore, I will rather remove it completely than fixing this bug. ;)