Blue crystal

This is how it is in the map, although it is indeed strange; it would be better to remove the highlighting specifically for the units that join. But it's better to play this map without mods; otherwise, the scripts won't work correctly at the end.

I didn't do this intentionally. I just have to move composite units at the beginning of the game, which causes them to lose their flag and highlighting.
And I have to move them because the function that creates monsters doesn't place them in a specific cell if another monster is nearby.