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Thank you, dear Hottab! Everything worked out. I enjoyed playing through several campaigns with the new configuration. I noticed one thing: if you install a mod to unlock campaign heroes in scenarios, heroes with modified parameters will be missing when selecting. For example, I can select Shadia with the spec_evasive specialization, but I can't select Ilia with the exact same specialization. Does the game think they are the same hero?
Your hero's file has priority because it is newer, which is why Ilia disappeared from the list.