Seelah: Inheritor's Favor sometimes fails

Seelah's Inheritor's Favor is not working properly. Sometimes I'm not given the option to recharge or discard the blessing, causing the blessing to be discarded automatically. Last time it happened, I was playing Brigandoom, trying to close the Prison after defeating the henchman. I used Inspired Grace (which unfortunately made me discard a card because it was not a blessing, nor a spell) and a Favor of Iomedae. After I succeeded at closing the location, I realized that the Favor was in my discard pile.