Gothic 1 Crash as soon as gameplay starts if used in combination with a texture pack

[harooooo1]

Gothic 1 on steam with Union, and with DX11. If textures are set to "Ultra High", and if a big texture pack is used like Artemianos Texture Pack or something similar, the game crashes as soon as you start gameplay.

To Reproduce
Steps to reproduce the behavior:

1. On steam, install Gothic 1, use the workshop version launcher
2. Install Union mod
3. Install GD3D11 mod (i tried several different versions, the popular one on steam, the one from this github, as well as the one from SayansKing, they all crash same way)
4. Install Artemiano's Texture Pack, or some other bigger texture pack
5. Launch game
6. Check that your DX11 settings are set with Textures: Ultra High
7. Start New Game
8. Crash to desktop
   Expected behavior
   Expected is that it doesn't crash

Graphics card: AMD Radeon RX 6800 XT ASUS TUF Gaming OC, Windows 11, Ryzen 5600T, 32GB DDR4 3200MHZ CL16
Gothic version: G1 on Steam with Union 1.0m, SystemPack 2.0

Additional context

Crash log from clipboard:

======================================= UNHANDLED EXCEPTION OCCURED ======================================================
======================================= CRASH INFOS: =====================================================================
GOTHIC 1.08k_mod, Parser Version: 50
User: haroo, CPUType: 586, Mem: 2048 MB total, 2048 MB free
Camera: Pos(5615.73633/5367.95166/36676.6641), At(-0.340637475/0/-0.940194726)
Startup Options:-game:GothicGame.ini
=============================================== CALLSTACK : ==============================================================
0023:77A83E31 (0x417AD020 0x00000000 0x7196A3A1 0x00000001) g1_avx2.dll, Ordinal956()+343601 byte(s)
0023:77A8914A (0x5D84DDC8 0x00000000 0x436E6AC0 0x00080000) g1_avx2.dll, Ordinal956()+364874 byte(s)
0023:0071B407 (0x4825EC80 0x436E6AC0 0x4825EC40 0x436E6AC0) GothicMod.exe, zCTex_D3D::Unlock()+103 byte(s), D:\dev\gothic\current_work\ZenGin_Kurt\zRndD3D_Texture.cpp, line 332
0023:005C7CC4 (0xFFFFFFFF 0x437591FC 0x00000000 0x4825EC40) GothicMod.exe, zCTextureFileFormatInternal::ReadData()+564 byte(s), D:\dev\gothic\current_work\ZenGin_Dieter\zTexFile.cpp, line 753+7 byte(s)
0023:005C7D74 (0x00000000 0x005CC04B 0x0126F744 0x437591FC) GothicMod.exe, zCTextureFileFormatInternal::LoadTexture()+100 byte(s), D:\dev\gothic\current_work\ZenGin_Dieter\zTexFile.cpp, line 766+31 byte(s)
0023:007ADAB8 (0x00000000 0x00000000 0x00000000 0x00000000) GothicMod.exe, SetFileAttributesA()+145692 byte(s)