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Tested/occurred in Immortal Empires multiplayer, though fairly certain will happen anywhere.
Vampire Coast Bloated Corpse units auto explode at low health. Normally this might be intended, but it has an unfair and unintentional side effect of killing your own units if a battle starts with injured Bloated Corpses.
Basically, after deployment screen and hitting "start battle", the BC's instantly explode.
If they are part of a reinforcing army, the effect is worse and completely has no way around it (no 'counterplay' so to speak). Upon entering the map, they instantly explode, causing massive damage to your own tightly packed units that also just started streaming into the map proper.
This makes Bloated Corpses very punishing to yourself and thus discouraging anyone from ever using them. It means unless they are fully healed, any BCs are a threat to your own army and if you get attacked or they're part of reinforcements, they're going to kill your own army at the beginning of any battle. Basically the only thing to do at the moment is never use them, or never auto resolve a single battle, or never ever get attacked.
Assuming auto-explosion at low health is on purpose, an easy check and solution to this is add in the requirement of also taking damage while at low health. By adding this condition, any BCs that spawn injured will not automatically wipe out your army, but they will still explode if a single pebble is thrown their way.