updated to newest version for 1.20.1 open creative inventory or go near blocks mentioned world goes invisible except distant horizons
[18:17:28] [DH-File Handler Thread[1]/WARN]: Exception loading blockstate definition: 'ars_additions:blockstates/warp_nexus.json' missing model for variant: 'ars_additions:warp_nexus#half=upper,requires_source=false'
[18:17:28] [DH-File Handler Thread[1]/ERROR]: Exception baking ars_additions:warp_nexus#half=upper,requires_source=false: org.embeddedt.modernfix.dynamicresources.ModelMissingException
[18:17:28] [DH-File Handler Thread[1]/WARN]: Exception loading blockstate definition: 'ars_additions:blockstates/warp_nexus.json' missing model for variant: 'ars_additions:warp_nexus#half=lower,requires_source=false'
[18:17:28] [DH-File Handler Thread[1]/ERROR]: Exception baking ars_additions:warp_nexus#half=lower,requires_source=false: org.embeddedt.modernfix.dynamicresources.ModelMissingException

My loading screen is showing these models as missing, too.
Minecraft -1.20.1 (Neoforge 47.1.106), Ars Additions 1.20.1-1.6.7, Ars Nouveau 4.12.7

[04/09/2025 19:58:31 PM] [19:58:31] [Worker-ResourceReload-1/WARN] [minecraft/ModelBakery]: Exception loading blockstate definition: 'ars_additions:blockstates/warp_nexus.json' missing model for variant: 'ars_additions:warp_nexus#half=lower,requires_source=false'

For both half=upper/lower and requires_source=false/true. (all four states) . No blockstates for warp_nexus.json in assets\ars_additions\blockstates. Interestingly enough, the entire thing generates just fine in-game.