card interaction bug
Opponent played Return Triumphant targeting Stock Pilling Celebrant. A Knight of doves entered the battle field with a Young Hero Role on it instead of a Stock Pilling Celebrant. I then Put CoopedUp on the Knight of Doves with the role on it. Later in the game I exiled the Knight of Doves using the Cooped Up ability. The opponents other Knight of Doves then triggered creating a 1/1 flying token when the role should not have hit the graveyard because it was exiled.
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[Deleted User] commented
You exiled the creature, not any auras attached to it. Those find themselves on the battefield not attached to anything, and state based actions clean that up by putting the auras into the graveyard. So the other Knight of Doves did see an aura hit the graveyard.