Dragon Bossbar

[BOT-Neil]

Describe the issue
Dragon bossbar is stuck on the end, if you try remove it it disapears for a split second then reappears.
Spigot version
git-Paper-278
Plugin version
2.10.0
How to reproduce
Make a world THE_END type, and there will always be a bossbar
Using method "world.getEnderDragonBattle().getBossBar().setVisible(false)" only works for a split second
Crash reports (if available)