Change log
- Hopefully fixed boss bar not disappearing
- Fixed boss bar disappearing time does't match the one actually displaying (it means when you hit large amount of entities, some died but some are not, the boss bar will follow the disappearing time of the type that actually showing to player)

This bugfix/patch reworked the boss bar removal timer, please tell me in the discussion section/pm along with the timings report if you are experiencing any server performance issues caused by this plugin.