Here i am again, so when i use your tanks in 3ds Max 2021 and i set the Render Method to High Quality the tank illuminates completely white. I have tried with a few other files from me and all of them work without this issue so this must be happening while exporting them.

AMD Radeon 580 GPU

Screenshot:

Thought i open a new issue since its a new problem

Did you find the problem?
I don't have that issue here but Ill double check.

Until now i haven't found the problem now. But i guess it must be happening while exporting and owning a AMD card somehow.

Try this re-build of 114 and see if the tanks are shading ok.
I found some odd characters at the start.

I am closing this.. I am going to get a used AMD card at some point and sort out the issues with the shaders.