The Bug:

When a dragon is respawned, the purple bossbar should default to saying "Ender Dragon" (or the equivalent in another language). However, the dragon keeps its name from an earlier dragon fight, even though the dragon itself does not have that name.

Steps to Reproduce:

1. Enter the end and change the ender dragon's name to "Fred" by using the command provided below.

   /data merge entity @e[type=minecraft:ender_dragon,limit=1,sort=nearest] {CustomName:"{\"text\":\"Fred\"}"}

2. Kill the ender dragon.

   /kill @e[type=minecraft:ender_dragon]

3. Respawn the ender dragon by placing four end crystals around the end altar.
4. When the ender dragon is resummoned, look at the bossbar at the top of your screen to check its name.
5. Take note as to whether or not the ender dragon's name is not reset when it is respawned in the end.