Reactions in general seem to be a bit wonky. I was trying out multiplayer a couple days ago and our cleric noticed that not only did their warding flare reaction vanish on level up, but that their opportunity attack then vanished at some point too. There was no way to get them back onto the reactions bar so they were just left without. They seemed to come back on reloading, but this happened at least twice, forcing us to reload. (Cleric player has already put in several feedback forms about it)
I've also noted that turning reactions on and off is very temperamental.
