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After struggling with it for an evening, I finally managed to find a solution:
1) Go to the material properties.
2) In the AlphaMode line, set it to AM_OVERLAY.
3) In the Priority line, set it to 224.
And voila, we are no longer bothered by overexposure. So far, I've only encountered a small glitch in one place - in the background of the small smoke from the dwarf city with a certain camera angle. Basically, it's a minor issue.
What prevented you from showing it in a screenshot?!
С уважением, Psatkha (Псатха) 
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1