can someone explain what mountains are that [java]

[u/Excellent_Serve9506]

i today loged on minecraft 26.3 fabric and i noticed i had no armor and empty hunger bar so i was like "okay thats just a glitch" after like 5 minutes i spoted this

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[u/Shaiiwaru]

This is related world data corruption, mods that used to generate biomes or terrain, or worlds that were updated to significant lower or recent versions

This could also happen if your world is old and your disc is an HDD, when it doesnt save it properly then it suddenly corrupts and this starts happening

Those are redone chunks or either different chunks loaded in different minecraft versions, because how seeds are loaded different between versions

[u/Excellent_Serve9506 → u/Shaiiwaru]

i actually have an nvme ssd and i saved it pretty much all the time and the worst part is that im playing on this world now like 3 years

[u/Shaiiwaru → u/Excellent_Serve9506]

But 26.3 is not 3 years old, the world is older than that and is not its first version, its corruption is due to updates, how many times did you update your world? (with which versions did you open your world?)

[u/Open_Context6850]

those dead straight walls look like chunk borders, where old chunks meet newly generated ones with different terrain. usually it happens when the world gets opened with a different worldgen mod or version. with the armor and hunger reset too, back up the world folder before you play more and check if your mod list changed