Nether Structure files not found on initial Nether entry

[T145]

This seems to be similar to #36, except I'm not using Sponge.
Currently this is running on an older computer that needs to run JRE 8_51 to avoid Pixel Format Not Accelerated errors.

The error

System specs:

[09:33:17] [main/INFO] [FML]: Forge Mod Loader version 14.23.2.2611 for Minecraft 1.12.2 loading
[09:33:17] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:6.3

Mod list:

  AIImprovements-1.12-0.0.1b3
  Aroma1997Core-1.12.2-1.3.0.2
  AromaBackup-1.12.2-2.1.1.3
  AutoRegLib-1.3-16
  base-1.12.2-3.7.1
  BaubleOfUndying-1.12-1.0.1
  Baubles-1.12-1.5.2
  BetterFps-1.4.8
  Born+In+A+Barn+V1.8-1.12-1.0
  BowInfinityFix-1.11.x-1.12.x-rv5
  Chunk+Pregenerator+V1.12-1.7.1
  ChunkAnimator-MC1.12-1.2
  Clumps-3.0.0
  colorful-sheep-1.12.2-1.0.0
  colytra-1.12.2-1.0.4.3
  Controlling-3.0.6
  craftdev-core-1.12.2-2.2.8
  CraftingTweaks_1.12.2-8.1.8
  CustomBackgrounds-MC1.12-1.1.1
  deepmoblearning-1.12.2-1.2.0
  diethopper-1.1
  FastWorkbench-1.12.2-1.3.1
  foamfix-0.9.5-1.12.2-anarchy
  ForgivingVoid_1.12.2-1.0.17
  gentleharvest-1.12--b1
  GravelMiner_1.12.1-6.1.2
  Hwyla-1.8.24-B39_1.12
  infinimend-1.12-1.0.2
  infotooltip-1.12.2-1.0
  InventoryTweaks-1.63
  itemzoom_1.12.1-1.10
  jei_1.12.2-4.8.5.159
  jeiintegration_1.12.2-1.5.1.36
  jepb-1.12-1.2.1
  justenoughdimensions-1.12.1-1.5.5
  JustEnoughResources-1.12.2-0.8.5.27
  justthetips-1.12-1.0.1.1
  LunatriusCore-1.12.2-1.2.0.42-universal
  minecartaifix-0.1.1-1.12.2
  missingtextures-1.12-1.0.0
  modnametooltip_1.12.2-1.10.0
  MouseTweaks-2.8-mc1.12.1
  NetherPortalFix_1.12.1-5.3.13
  NoFov-MC1.12-1.0.1
  nomoreglowingpots-1.0
  NoNausea-MC1.12-1.0
  noRecipeBook_v1.1.0formc1.12.2
  NotEnoughIDs-1.5.4.2
  OptiFine_1.12.2_HD_U_D1
  OreSpawn-1.12-3.3.0.136
  PersistentBits-1.12-1.0.6a
  Ping-1.12.2-1.4.3
  Placebo-1.12.2-1.3.2
  Potion+Icon+Remover-1.12-4.0.0
  ProjectE-1.12-PE1.2.0
  Quark-r1.4-123
  QuickLeafDecay-MC1.12.1-1.2.4
  RebornCore-1.12.2-3.7.0.234-universal
  RebornStorage-1.12.2-3.0.5.41
  refinedstorage-1.5.32
  refinedstorageaddons-0.2
  Regressments-1.0
  RemoveMouseoverHighlight-1.0
  Stackie-1.12.2-1.6.0.48-universal
  StepupFix-1.12.2-1.0.0.4
  stg-1.12.2-1.2.3
  tellme-1.12.2-0.5.6
  thebomplugin-1.12-0.2.3
  Toast+Control-1.12.2-1.4.1
  TreeChopper-1.12.2-1.2.4
  unloader-1.0.1
  WailaHarvestability-mc1.12-1.1.12
  WAIM-1.0.0
  Wawla-1.12.2-2.5.253
  Xaeros_Minimap_1.15_Forge_1.12
  YUNoMakeGoodMap-1.12-6.3.0.29