some of my world can successfully update to 7.2.2, but some others still have level.dat problem
only when update pixelmon mod wiill happen ,don't know why...



Forge Version:
Forge 14.23.5.2847

Mods:
animania-1.12.2-1.7.3.jar
CraftStudio-1.0.0.93-mc1.12-alpha.jar
BaubleOfUndying-1.12-1.0.1.jar
Baubles-1.12-1.5.2.jar
BringMeTheRings-0.4.jar
colytra-1.12.2-1.2.0.4.jar
MendingGems-1.12.2-1.0.0.jar
CarryOn+MC1.12.2+v1.12.3.jar
obfuscate-0.2.6-1.12.2.jar
coroutil-1.12.1-1.2.35.jar
zombieawareness-1.12.1-1.11.16.jar
DynamicSurroundings-1.12.2-3.6.0.2.jar
OreLib-1.12.2-3.6.0.1.jar
Bountiful-2.2.1.jar
Forgelin-1.8.4.jar
future-mc-0.2.0.jar
CustomLANPorts-1.12.2-1b.jar
HammerCore-1.12.2-2.0.4.2.jar
Patchouli-1.0-20.jar
touhoulittlemaid-1.12.2-1.1.9-release.jar
journeymap-1.12.2-5.5.9.jar
Xaeros_Minimap_1.18.4_Forge_1.12.jar
DexNav-1.0.0.jar
IVChain-1.2.2.jar
PixelExtras-1.12.2-2.5.4-universal.jar
Pixelmon-1.12.2-7.2.2-universal.jar
pixelmonclothesmod-1.2.2.jar
PixelmonInformation-1.12.2-7.2.0-0.3.4.jar
CreativeCore_v1.9.54_mc1.12.2.jar
IGCM_v1.2.10_mc1.12.2.jar
PlayerRevive_v1.2.26_mc1.12.2.jar
Stellar+API-1.12.2-0.4.2.9.jar
aether_legacy-1.12.2-v1.4.4.jar
AppleSkin-mc1.12-1.0.9.jar
astikorcarts-1.12.2-0.1.2.7.jar
autothirdperson-1.2.1.jar
BedFix-1.0-MC1.12.jar
bettermobgriefinggamerule-1.12.2-7.0.1.jar
BiblioCraft[v2.4.5][MC1.12.2].jar
BiomesOPlenty-1.12.2-7.0.1.2444-universal.jar
CakeMod_1.5.jar
CashCraft-1.12.2-4.0.0.1.jar
ChinjufuMod[1.12.2]3.2.2.jar
CleanView-1.12.2-v1c.jar
clearwater-1.2.jar
CoffeeSpawner-1.12-1.0.2.jar
CosmeticArmorReworked-1.12.2-v4a.jar
CustomNPCs_1.12.2(30Jan19).jar
dirt2path-1.8.0.jar
dismounte_1.12-1.0.jar
DoggyTalents-1.12.2-1.15.1.4-universal.jar
doubledoors_1.12-1.2.jar
ElectroblobsWizardry-4.2.6-MC1.12.2-tw.jar
enchxchg-1.12.2-1.2.14.jar
Fakename+MC1.12.2+v1.2.jar
ForgivingVoid_1.12.2-1.0.23.jar
FreeLook-1.0.jar
furniture-6.3.1-1.12.2.jar
Harvest-Festival-Legacy-1.12.2-0.6.17.jar
Hwyla-1.8.26-B41_1.12.2.jar
jei_1.12.2-4.15.0.268.jar
keywizard-1.12.2-1.7.3.jar
MutantBeasts-1.12.2-0.6.0.jar
NaturesCompass-1.12.2-1.6.0.jar
NoMoreRecipeConflict-0.13(1.12.2).jar
noRecipeBook_v1.2.2formc1.12.2.jar
Pam's+HarvestCraft+1.12.2zd+Surprise+for+Yogcast.jar
phosphor-1.12.2-0.2.6+build50-universal.jar
portablecraft-1.1.jar
Skye's+Bakery+2.0.2+for+MC1.12.2.jar
SmoothFont-mc1.12.2-2.1.1.jar
structurize-1.12.2-0.10.198-ALPHA.jar
switchbow-1.5.6.jar
Sword_Shield-_1.0.0.jar
TheBetweenlands-3.5.6-universal.jar
ToolBelt-1.12.2-1.9.10.jar
trade-1.0.4.jar
TravellersBackpack-1.12.2-1.0.21.21.jar
ViesCraft-1.12.2-5.9.13.jar
villager-market-1.12.2-1.0.1.jar
Waystones_1.12.2-4.1.0.jar

I know that your other ticket was left behind, apologies for that.
But this is pretty much the same as the other one.