Environment:
Edition: Minecraft: Java Edition
Version: 1.21.8 (latest release)
Vanilla (no mods, no datapacks)
Steps to Reproduce:
Defeat the Ender Dragon so the exit portal is active.
Place four End Crystals on the portal frame to start respawning the dragon.
While the new crystals are generating on top of the obsidian pillars, place another End Crystal directly on the exit portal floor.
Immediately destroy this extra crystal before the regeneration sequence finishes.
Expected Result:
The exit portal should regenerate normally, regardless of whether an extra crystal is placed and destroyed.
Observed Result:
The exit portal does not regenerate properly.
Some portal blocks are missing or the frame remains incomplete, leaving the portal in a bugged state.
Additional Information:
This occurs consistently in 1.21.8.
No mods or datapacks installed.
Singleplayer world (normal survival).
Attachments:
Video demonstration: https://youtu.be/y5n8eWXGpck
Environment
Minecraft: Java Edition 1.21.8
Singleplayer
No mods, no datapacks
OS: Windows 10
Java: 23
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We are tracking this issue in MC-259670, so this ticket is being resolved and linked as a duplicate.
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