(Possible) Shen bug.

I'm not entirely sure f I'm allowed to report possible bugs, but I'm going to do it anyway since if it is the case then this bug could cause some issues. I was recently playing a game as Shen, and a teamfight broke out in mid lane. I ulted to our Kalista to keep her alive during the initial burst, but then something strange happened. The shield I gave her disapeared along with the visual effect as if I had been interrupted when it was halfway depleted, but I finished the channel and teleported to her as normal. My ult was not consumed and I was able to use it again seconds later, shield, TP and all.

It may have just been the game moving too fast for me to process but my friend whom I was playing with noticed and commented on it too, I've not been able to recreate this so it seems to be fairly rare if it even does happen, thank you for taking the time to read this.