screen issues with HoMM 6

hey everyone! I recently got a new PC and wanted to try playing MaM again as it was one of my favourite games growing up. The story modes work as usual however when I try to play a custom game it comes crashing down. Whenever I use a portal or sometimes just load into a custom game the entire graphics go dark.

I wanted to ask if anyone has experienced this before and knows how to fix it.

https://preview.redd.it/s4a5zkfv2tng1.png?width=1920&format=png&auto=webp&s=d364845ba3ac849efcf494a6618096ace4cfa842

small edit, I tried adjusting the graphics, went into windowed mode and installed WineD3D but nothing helped