I found out that the main reason for this hell (especially for FC 26) is that Vram can't handle second half scenarios, because the game engine has a bug which is the inability to delete or remove first half graphical stuff (unused graphics, scenario) when the first half ends, therefore the Vram would be already filled with unused stuff. That’s my conclusion about it.
At first, I was a breath of fresh air to EA and thought they would fix such a terrible bug, especially because it's a problem with the engine cores.
But for now, I threw the towel