First of all this happened before the 09-11-2017 patch
I got in a fight where Gully was on low health. I queued Calibretto to heal her (with the strongest 1 person heal ability). Unfortunately the enemy got his turn first and downed Gully. Garrison revived Gully with a minor revive potion. Calibretto’s heal activated on Gully now but healed 0 points of HP. This might be a bug? The heal did not swap to one of the other 2 team members.
And later there was an enemy stuck in the map where I could not go: