data-fixer issues
MC-116928Command block and spawner minecart data fixer not working correctly
Fixed
MC-124343Command block minecart data walker never runs due to comparing different types
Fixed
MC-132248Server crash on launch using Java 9 or newer
Fixed
MC-228367Several advancements are ignored when upgrading from 1.16.5
Won't Fix
MC-232104Minecarts cause chunks to be corrupted/reset when loading worlds from before 1.5 (13w02a)
Fixed
MC-232550Legacy flower pots are not correctly upgraded
Confirmed
MC-245772Outdated chests' loot tables get deleted when updating to 1.18.1
Fixed
MC-249697Spawn eggs set to spawn certain entities lose their name when upgraded to 1.13+
Won't Fix
MC-249699Potions in worlds from before 1.9 become water bottles when upgraded
Normal MC-249700Wood items become logs if upgraded to modern versions
Low MC-249703Leaves items with incorrect damage/metadata values become oak/acacia instead of their actual species
Won't Fix
MC-249849Lit furnace items are outright deleted when a world containing them is loaded in the latest version
Won't Fix
MC-249850Lit redstone lamp items are outright deleted when a world containing them is loaded in the latest version
Low MC-249870Sculk shriekers naturally generated in 22w11a or 22w12a can't summon wardens after upgrading to 22w13a
Won't Fix
MC-251314Goats loaded from older worlds lose their horns
Fixed
MC-253134Allays from older worlds don't duplicate
Fixed
MC-257113Ender dragon, wither, snow golem and iron golem spawn eggs from before 1.13 do not convert properly
Fixed
MC-257688Spawn eggs from versions prior to 1.13 have extraneous NBT
Won't Fix
MC-262369Eyes of Ender no longer take me to the nearest stronghold
Duplicate
MC-264319Armor Stands from worlds created before 1.9 have their items shuffled and deleted when upgrading to modern versions
Duplicate
MC-265731Controls bound to "APPS" in 1.12.2 and earlier become unbound when upgrading to the latest version
Won't Fix
MC-265853Controls bound to "SLEEP" in 1.12.2 and earlier become unbound when upgrading to the latest version
Won't Fix
MC-266254Controls bound to "POWER" in 1.12.2 and earlier become unbound when upgrading to the latest version
Won't Fix
MC-269535Items with multiple instances of the same enchantment are not upgraded correctly
Works As Intended
MC-269553Items with empty enchantments NBT tag do not upgrade as expected
Fixed
MC-269837Stack sizes 65-99 from prior versions are not upgraded as expected when accounting for maximum stack size component
Works As Intended
MC-270162The game crashes when attempting to upgrade a world from version 1.12.2 and below
Fixed
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