Cow carcass not working when opp. passes the turn and that's the last one for round?

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Cow carcass not working when opp. passes the turn and that's the last one for round?

Since one can only create topics here if one has below ten posts...well. The topic title (damn character limitation) pretty much states my question/problem. Cow carcass goes off after the opponent has ended his turn twice and usually, even if he passes it. However, when I pass my turn and the opponent passes his, at which end the cow carcass should go off...it doesn't. No idea why. After all, that doesn't follow the card's description.
 
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