Tbh its been like this for months, but when you play Caria Felsoul and she transforms into Magheridon, it only stays on the board without doing its end of the turn effect, which in this case is dealing 3 damage to all enemies. Not only that but it stays dormant for the REST of the game. So it makes the interaction kinda useless, unless you play him normally.
And it used to not be like this, it used to work normally.