[Riot] Possible bug with masteries/dynamic queue

There may be a bug when trying to save masteries with ~1 second left in lobby time before the match starts. When trying to save masteries with the minor amount of time left you will enter game without any masteries, however once the game is over your masteries will have been saved as though you had been using them. I've done this twice, the first time I dismissed it, but the second time I figured it may be a bug. I'm not sure if that's how it's supposed to happen or if this is a visual or gameplay bug. Just thought I'd let you know. (Both times this happened I was playing in ranked dynamic queue. Not sure if this spreads into blind or normal queues).