I am 100% sure that there isn't, because if there was, the developers wouldn't have duplicated the sides, for example, with the chain of monks.
In the .xdb file, for the Material, set the Is2Sidеd parameter to true - by default, this parameter is false!

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