Tested with both Sacrifice to Mathlann (black arks) and Sacrifice of Xlaxgor (legendary skink chief).

The game spawns the characters twice instead of only once (character listeners only triggered once):

- Mathlann spawns one in the pool as it should and another one on the campaign map.

- Xlaxgor spawns 2 in the pool, one with free cost as it should and another one with regular recruit cost.

Screenshots attached are before/after the ritual and the listener triggers. Ignore the kroxigors, they are totally 2 skinks I promise.