Posts from Maybe someone can offer some advice.

Well, the invisibility effect is present on all colors. Even if the issue were related to the color, why does another hero, who was previously visible, become invisible after the first hero is completely removed from the game?

It's complicated. The time for wild guesses has come – the mod for the hero is broken; the paths to the hero's models are incorrectly specified in the character file, and it also contains a file that "fixes" the character of another hero (or fixes the MapObject of the hero itself). Therefore, when you delete it, the other hero breaks, but that sounds incredibly unlikely.

I believe the bug is in the Characters/Heroes/Dungeon/Kaldoin/Raelag_LOD.(Character).xdb file.

If the paths to the models are incorrectly specified in it, the result will be exactly as described.

then why isn't there a bug in Heroes of Kaldor? The path to that folder is the same for both Kaldor and Cordar.

Added after 59 seconds
and even if you take the standard model from the original game, it's the same, although there shouldn't be any errors in the Characters there.

I can't answer that question((( black magic of scripts -_- the script doesn't look for a specific hero, but rather for some kind of last one in the list and consumes its model