Today, I just summon random mobs in my world, but when I summon the Ender Dragon in the overworld. It's disappear after about 5 secs as in the video.
Video Link:
MC-146316
Ender dragon disappears after being spawned with /summon
Resolved
Fixed
4
EpicEmeraldPlayz
Nathan Adams
Confirmed
Mob behaviour
Minecraft 19w12a, Minecraft 19w12b, Minecraft 19w13b
Minecraft 19w14a
Retrieved
Dragons getting positioned at NaN ("disappearing") seems only to apply to dragons summoned without a DragonPhase, not to those with.
I've waited for a couple minutes, so far the dragons summoned with a DragonPhase seem to not be affected by this.