Greetings, Halogen Team!
Thank you for porting sodium to forge. It's incredible useful!

Just one issue:

• When loading the seed 1242070278697449143 on default settings, the spawn biome is converted to a Plains.
• Otherwise, it would be a Snowy Tundra spawn.
  (however, some Snowy Tundra still generates North West)

No idea what caused the issue (all modded structures still generate as usual), apart from Halogen itself 😅

Mod list:

• _MixinBootstrap-1.1.0.jar
• abnormals_core-1.16.5-3.3.0.jar
• absentbydesign-1.16.5-1.5.0.jar
• appleskin-forge-mc1.16.x-2.1.0.jar
• Aquaculture-1.16.5-2.1.21.jar
• AttributeFix-1.16.5-10.1.2.jar
• AutoRegLib-1.6-49.jar
• BackTools-1.16.5-10.1.0.jar
• BedBenefits-1.16.5-5.0.3.jar
• BetterBurning-1.16.5-6.0.6.jar
• BetterDrowning-1.16.5-2.0.2.jar
• BetterHunger-1.16.5-6.0.1.jar
• BetterMineshafts-Forge-1.16.4-2.0.4.jar
• Blur-1.1.0-1.jar
• Bookshelf-Forge-1.16.5-10.3.29.jar
• BotanyPots-1.16.5-7.1.23.jar
• BotanyTrees-1.16.5-3.0.5.jar
• Buddycards-1.16.5-2.5.0.jar
• CauldronRecipes-1.16.5-6.0.1.jar
• cavebiomeapi-1.16.5-1.3.7.jar
• CavesAndCliffsBackport-1.16.5-6.3.jar
• chunkloaders-1.1.7-mc1.16.5.jar
• citadel-1.8.1-1.16.5.jar
• cloth-config-4.11.26-forge.jar
• Clumps-6.0.0.27.jar
• collective-1.16.5-2.64.jar
• ColtCosmeticArmorMod-1.2.5.jar
• Controlling-7.0.0.26.jar
• corpse-1.16.5-1.0.5.jar
• CosmeticArmorReworked-1.16.5-v4.jar
• create-addon-v5.jar
• create-mc1.16.5_v0.3.2d.jar
• createplus-1.16.4_v0.3.2.1.jar
• curios-forge-1.16.5-4.0.5.3.jar
• Disenchanting-forge-1.16.5-1.7.2.jar
• DungeonsArise-1.16.5-2.1.47-release.jar
• DynamicSurroundings-1.16.4-4.0.4.2 (1).jar
• EasyMagic-v1.0.3-1.16.5.jar
• endremastered-forge-R4.1.1.jar
• EnigmaticLegacy-2.11.5.jar
• ExplorersCompass-1.16.5-1.1.2-forge.jar
• extraboats-1.16.5-2.1.0.jar
• FarmersDelight-1.16.5-0.4.3.jar
• fastbenchminusreplacement-1.4.jar
• fastfurnaceminusreplacement-1.1-1.16.3.jar
• FastSuite-1.16.4-1.1.1.jar
• ferritecore-2.0.7-forge.jar
• filenames.txt
• findme-1.16.3-2.2.0.0.jar
• fishtraps-0.1.3.jar
• flywheel-1.16-0.2.4.jar
• ForgivingVoid_1.16.5-5.2.1.jar
• FriendlyFire-1.16.5-7.0.2.jar
• geckolib-forge-1.16.5-3.0.46.jar
• goblintraders-1.6.0-1.16.3.jar
• guardvillagers-1.16.5.1.2.6.jar
• Hats-1.16.5-10.3.1.jar
• HLSpells-1.16.5-1.1.jar
• iChunUtil-1.16.5-10.4.1.jar
• immersive-portals-0.16-mc1.16.5-forge.jar
• Jade-1.16.4-2.8.0.jar
• jei-1.16.5-7.6.1.75.jar
• JustEnoughResources-1.16.3-0.12.0.100.jar
• Kiwi-1.16.5-3.5.2.jar
• lazydfu-0.1.3.jar
• mimic-1.16.5-v1.12.jar
• minerlore-2.0b.jar
• mostructures-forge-1.2.0-1.16.5.jar
• MouseTweaks-2.14-mc1.16.2.jar
• mowziesmobs-1.5.19.jar
• NaturesCompass-1.16.5-1.9.1-forge.jar
• PassableFoliage-1.16.5-2.4.0.jar
• Patchouli-1.16.4-53.2.jar
• Pillagers-1.16.5-3.0.1.jar
• Placebo-1.16.5-4.6.0.jar
• Pollinate_NBE_1.2.0.jar
• polymorph-forge-1.16.5-0.24.jar
• Quark-r2.4-316.jar
• reap-1.16.5-1.0.0.jar
• relics-0.2.11.1.jar
• repurposed_structures_forge-3.2.8+1.16.5.jar
• smoothboot-forge-1.16.4-1.2.2.jar
• SnowRealMagic-1.16.4-2.5.7.jar
• snowundertrees-1.16.5-v1.3.jar
• sodium-forge-2.9.10+rev.ea6353c.jar
• SoL-Carrot-1.16.5-1.10.1.jar
• SpeakerMod-1.36.0.5.jar
• StrongerSnowballs-1.16.5-5.0.1.jar
• supermartijn642configlib-1.0.9-mc1.16.jar
• tea_kettle-1.16.5-0.4.0.0.jar
• torchslabmod-1.16.4_v1.6.19.jar
• TrampleNoMore-1.16.5-6.0.1.jar
• TravelersBackpack-1.16.5-5.4.2.jar
• turtlemancy-1.16.5-1.6.3.jar
• upstream-1.0.jar
• villagernames_1.16.5-3.3.jar
• VillagersRespawn-1.16.5-1.36.0.4.jar
• villagespawnpoint_1.16.5-1.8.jar
• Xaeros_Minimap_21.5.0_Forge_1.16.5.jar
• XaerosWorldMap_1.17.0.1_Forge_1.16.5.jar
• YungsApi-1.16.4-Forge-12.jar

Hope it gets sorted sometime!
(though, no rush!)
Will try to provide as much help as possible, as required!

Take care, and thanks again for this lovely mod!
(and the Fabric suite!)