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Still under the fresh impression of an outrageous act… (crossed out). Passing through this station, I was deeply disturbed by the following… (crossed out). The following outrageous incident occurred before my eyes, vividly illustrating the state of our railway system… (the rest is crossed out, except for the signature).
A.P. Chekhov. "Complaint Book"

Yesterday, in the last battle on the "The Lone Knight" map, I observed outrageous behavior from the AI several times. I haven't seen anything like this before.
After my Ghost Dragons sometimes aged (a known ability, expressed by reducing health) Lea de Vuz's dragons, she cast Dispel Magic on the aged stack. However, she was wearing the Father Dragon's Might, neither she nor I had the Sphere of Vulnerability equipped, and yet she was removing the aging effect even from her own Azure Dragons! This is a clear violation of the game's rules, something a human player could not do.
I suspect (just as it happens with the sudden flights of AI heroes when there is no spell or artifact that grants it), that this is not intentional cheating, but simply that the game developers, while programming the AI's behavior, forgot to include some checks in the code. But, of course, this can only be said for sure by looking at the source code (unfortunately, it is unlikely that they will be "declassified" anytime soon).
I immediately took screenshots to make sure for myself and prove to everyone that I wasn't imagining things. This happened in at least 3 different battles (the location of the corpses of my units and the number of creatures in the stacks confirm this) and on different dragons. I can also attach the save file, but I cannot guarantee that the same thing will happen to you: for this to happen, the "aging" effect must trigger on the Ghost Dragons.