There is a loss of data when opening a 1.15.2 world in a version at (or past) 1.16.
Steps to Reproduce:
Create a new world in a version before 1.16 with structures enabled
Enter the nether
Locate a fortress structure:
/locate structure minecraft:fortress
Teleport to it using the command provided
Leave the world, and join in the latest version
Repeat step 3
The command will locate a fortress which is further away, despite the player standing on top of (or near) a fortress.
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This is actually MC-184311, which was closed under the assumption that Nether fortresses generated in 1.15.2 were not affected.
In snapshot 24w46a, the fortress is still not recognized after upgrading from a world created prior to 1.16.
In my test, the /locate
command finds a further away fortress, ignoring the one I am on top of:
Can confirm, although blazes and wither skeletons are still spawning in previously generated fortresses, and the advancement "A Terrible Fortress" is still granted upon entering, so this may just be an issue with the
/locate
command.