Health bar will not go away unless player relogs.
*What version of Minecraft are you using? 1.16.2
What server jar are you using? PaPerSpigot 1.16.2 #186
What is this a bug report for? MythicMobs
What version of the plugin are you using? build 3438
I have the impression that there is a bug when the mob is not killed in a "vanilla" way but deleted by an command.