Auto-translated
I wouldn't call this a bug; there are many undocumented features in the game, for example:
- a medal for bravery, granting immunity to mind control spells
- if you equip the Cloak of Renunciation and the Orb of Inhibition, it will prevent Prayer from the Angel Alliance, but spells from the Armor of the Damned will still work. This feature (perhaps it can be considered several features) is especially interesting because it allows a low-level hero to counter armies with much higher stats, and even higher-level heroes.
- Mythical dragons in the player's army (unlike neutral ones) can cast powerful spells under the Orb of Inhibition.
Those who wish can continue the list.
All of the above (and what is not listed from this series) are shortcomings of the game, which can be equated to bugs. If 3DO had initially positioned Heroes of Might and Magic 3 as a multiplayer game, rather than a single-player game, patches with fixes would be released regularly. And we would have arrived at the desired state through official means.