The bug

Some, but not all, chests in structures have different loot even when using the same world seed. The following is a complete description of which structures are affected.

About half of the chests give the same loot, but in a random order. This is indicated with a , but the order should be fixed as well. Additionally, enchantments are always different, even in the consistent chests.

Seed for all of these examples: -626760004

Desert Temple
/tp 1641 53 -406
Same loot, different order
   

Shipwreck
/tp 39369 36 2438
Same loot, different order
   

Buried Treasure
/tp 39320 36 2185
Same loot, different order
   

Pillager Outpost
/tp 2746 83 5609
Same loot, different order
   

Ocean Ruins
/tp 2332 34 14452
Same loot, different order
   

Igloo Basement
/tp 23628 49 37922
Same loot, different order
   

Woodland Mansion
/tp 14572 91 14420
Same loot, different order
   

Nether Fortress
/tp 5242 53 -66
Same loot, different order
   

End City
/tp -648 120 977
Same loot, different order
   

Village
/tp 1456 89 127
   

Abandoned Mineshaft
/tp 1284 26 45
Chest didn't even generate in one world
   

Dungeon
/tp 1241 33 702
   

Stronghold
/tp 947 36 1041
   

Ruined Portal
/tp 964 66 2548
   

Jungle Temple
/tp 9846 75 2403
   

Piglin Bastion
/tp 5016 73 446