Good afternoon!

The game crashes when starting a new single-player game after adding new maps (random ones – of different sizes, etc.) downloaded from trusted sources (heroesportal.net).
Previously, maps were added and worked normally.
If you delete the newly added map, the game does not crash.*
If you delete all maps except the new one, the game crashes.
Reinstalling the game does not help. Moreover, if you add maps to a freshly installed game that were used before the reinstallation (i.e., previously added non-standard maps), the game starts normally. But with the new maps, it crashes.
I cannot accurately identify the date when this error occurred because I am launching the game after a long break.