When re-creating a world that was created in the 21w06a snapshot, the world type cannot be changed. It is set to "Custom" and greyed out, regardless of the actual world type.
To reproduce
Create a new world with the "Default" world type.
Use the "Re-create" function to copy this world.
→ ❌ The world type is greyed out and set to "Custom".
Linked issues
is duplicated by 1
Attachments
Comments 6
Just as a note, the world type is not custom, it is correct and whatever you had set it to, it just renders as custom.
Relates to MC-214779