The game crashes when open a worls from 1.15.2 in 20w16a, 20w18a, 20w21a!
Environment
Win 10,
Linked issues
duplicates 1
Attachments
Comments 3
Thank you for your report!
We're tracking this issue in MC-177150, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game, you can check the Fix Version/s field in that ticket to learn more.
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Try updating to the latest 20w18a snapshot as this fixes a bug when a player "upgrades" their world / optimises it.