Describe the bug

So... I downloaded flans mod and two content packs that works correctly (modern warfare and simple parts), but for some reason the main mod doesnt. Im playing a modpack with my friends with the same mods but for them its working correctly. The main mod vehicles and some guns doesnt have textures and are all black, like the a-10 below. i dont have any shader downloaded or optifine.

Expected behaviour

well i expected to not be black

Screenshots

https://cdn.discordapp.com/attachments/1099477288598372482/1196990025594839060/2024-01-16_23.30.10.png?ex=65b9a2d5&is=65a72dd5&hm=69dc7018999da15fb6e112127af31c59b472c978a074a503cb0351f7ff7fe4ed&

Versions (please complete the following information)

• Forge: 1.12.2 14.23.5.2860
• Flan's Mod: 1.12.2 5.10.0 jar from curseforge

also i just downloaded it normally and placed the content packs in flan file