<Ivor>
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There are some nuances when creating a game; as far as I remember, if you save the map in the "maps" folder, there will be some issues with the heroes. Try leaving it in the "randommaps" folder.
Actually, it's the opposite; the map should be in the "Maps" folder. You can save it there directly or copy it there later. It's best if it's the first in the list or the only one.
This is not specific to the symmetrical template; this error occurs on any map with fixed starting factions.