We were trying to create a redstone-powered sea pickle farm, and this bug prevents it from working.
I'm not sure what the expected behavior is here, but the farm would have worked if the sea pickles multiply onto neighboring coral blocks (with neighboring flowing water), but then the flowing water immediately causes the newly-created sea pickles to "wash away".
This worked for me to delete the floating fire charges on our server:
/kill @e[type=SmallFireball]
I have uploaded the world files to Dropbox.