Boss bar doesn't show the name of the boss.

When you summon a boss, the boss bar still shows the same as usual. For example, if you do

/summon WitherBoss ~ ~ ~ {CustomName:"Example",CustomNameVisible:1}

the boss bar says "wither" instead of "Example" when you kill the boss by doing /kill @e[type=WitherBoss] it says:"Killed Example" I'd love to see this glitch fixed.