The underlying issue is that legacy scanning happens every time even if a DragonFight NBT compound already exists.
If you kill the Ender Dragon in the end and then remove all the end portal frames from the portal, then relog, you will see a new bossbar for a new Ender Dragon. You can't target it with @e as it doesn't actually exist yet, but it will spawn when you move far enough from 0 0. Basically this means that a new dragon always spawns if the frames are removed, even if you never placed the end crystals right. This limits what creative players can do in the end, as there's always a portal located (and a dragon, if the portal got removed)
How to reproduce
Open a creative world
Go to the end dimension and defeat the Ender Dragon
Break all the the end portal blocks
Break all end gateways
Exit the world and reload it
❌ You should see the Exit End Portal go back to how it was before the Ender Dragon was killed and the Ender Dragon's health bar appear at the top of the screen. Wait about a minute and the Ender Dragon will respawn.
Linked issues
is duplicated by 30
MC-105458
Ender Dragon bossbar with no boss, after a while the dragon appears for no reason.
Resolved
MC-108896
Ender Dragon regenerates if I exit and re-enter game
Resolved
MC-146089
Reopening a world resets Ender Dragon's health
Resolved
MC-147159
The Ender Dragon regains its heath after you save and quit a world
Resolved
MC-149079
Ender Dragon health resets upon exiting and entering the world
Resolved
MC-150576
Dragon health reset after relogging
Resolved
MC-152411
Ender Dragon regenerated health after all crystals are broken
Resolved
MC-156916
Saving & quitting mid-boss battle
Resolved
MC-166951
Logging out in the End refreshes the Dragon's health
Resolved
MC-167778
Ender dragon heath replenishes if game is exited and reloaded
Resolved
MC-168877
Ender Dragon respawn glitch
Resolved
MC-169071
the ender dragon
Resolved
MC-175137
Ender Dragon sometimes resets health when respawning/reloading world
Resolved
MC-180326
Ender Dragon healed completely after I died and/or logged back in
Resolved
MC-181494
Ender Dragon regens to full health after logging out/in
Resolved
MC-181624
Disconnecting then Relogging into a world fully heals the Ender Dragon
Resolved
MC-182176
Enderdragon not remembering its health
Resolved
MC-186542
dragon ender life restarts when you die or exit the game.
Resolved
MC-187097
Ender dragon's health and postion resets when re-entering the end
Resolved
MC-192870
Ender Dragon regains all of it's health when exiting and coming back into the world.
Resolved
MC-195775
Ender Dragon health resets after leaving and rejoining singleplayer world
Resolved
MC-196729
Ender dragon hp bar resets when you logout
Resolved
MC-199750
End/ Portal problem
Resolved
MC-201308
Ender Dragon Heals to Full After Saving/Quitting and Dying
Resolved
MC-203470
Enderdragon resets health after you save and quit
Resolved
MC-206207
Ender Dragon Healing
Resolved
MC-208299
Ender Dragon respawns with full health after save and quit
Resolved
MC-210069
If you damage the ender dragon and then leave the game, the ender dragon has full lives again.
Resolved
MC-218895
Ender Dragon reverts to full health
Resolved
MC-226329
Ender dragon regaining health when you exit the game
Resolved
relates to 2
Attachments
Comments 10
The effect is OPTIONAL. He's just stating it so it defeats the dragon FASTER. It's unrelated to the bug report ticket.
Post should be reedited to be more clear 😉 :
1. Open a creative world.
2. Go to the end dimension and defeat the Ender Dragon.
3. Break all the the end portal blocks. The torches, bedrock, and dragon egg can stay.
4. Exit the world and reload it. You should see the Exit End Portal go back to how it was before the Ender Dragon was killed and the Ender Dragon's health bar appear at the top of the screen. Wait about a minute and the Ender Dragon will respawn.
The problem might be that the legacy scanning happens every time even if a DragonFight NBT compound already exists
Confirmed for 18w44a.
MC-108896 just happened to me in 1.14.4-pre5
Do you know what is really weird? I am not affected by this. I tried to reproduce this so many times and I didn't manage to do it. This seems to be fixed for me in 1.15.1. Can you still reproduce this?
It still happens, but you also have to break all end gateways (added that to the description).
When I followed the steps to reproduce I only got the dragon health bar, not the actual dragon. I am also unable to remove that boss bar or summon a new dragon using end crystals. If the dragon is still alive then the dragon would also appear. If I try to reproduce this but I summon in an end portal block then it would behave as normal, but the dragon's health would be at full for a second.
[media]
I've ran into this issue today. The title and description of this bugreport is very unclear. I hope the mods can improve this ticket.
Improved title: Saving and re-opening the world respawns the dragon during the first fight
Affected versions: I've confirmed this for 1.15.2, 1.16 Pre-release 2
Video showing this issue: (in 1.16 Pre-release 2) https://www.youtube.com/watch?v=P0syIczLpOU
Steps to reproduce
Have an end without End Gateways (for example, a 'fresh' one the first time you enter the End)
Remove all the end crystals by punching or shooting them
Damage the dragon
Save the world
Re-open the world
The dragon will now despawn and a new full-health dragon will spawn. This also happens if you do not damage the dragon, but the effect is harder to notice then.
Confirmed for 1.16.5
Any effects outside the valid range of the effect amplifiers are considerd as invalid, see MC-10755.