Steps to reproduce the issue:
Enter the nether and find a structure
Enter the command /setworldspawn somewhere inside the structure bounding box
Enter the end, defeat the dragon, and enter the exit portal
Expected result: you should spawn at the highest safe y level
Actual result: you spawn on top of the block at y=0, inside blocks, and suffocate
Environment
Vanilla Java Edition 1.21.10, not modded
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're tracking this issue in MC-302144, so this ticket is being resolved and linked as a duplicate.
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For the record, you don’t need to defeat the dragon. Just dying without a bed or respawn anchor has a high chance of spitting you out in a bad spot, such at y=0 or above the Nether Roof.