I played a pair of SR draft matches (one full 5, one 3 premade) earlier and then went to play a normal TT game. In the champion select screen for the TT game all 6 of the champions the opposing teams had banned in those earlier matches had the unselectable crossed out 'banned' mark on them though they were still in full colour rather than greyed. Speaking with my team I was able to determine that this was localized to me and they were not seeing any champions marked unselectable. I was able to select one of them (I didn't try the rest) as normal. Not sure if there would have been any issue starting the game since the match disbanded when a summoner left. In the following champion select screen there were no issues and no champions appeared to be banned.
Thanks for this report! Someone sent me a screenshot with this bug, but exactly zero details. Now I have something to go on! Any additional details you can add, if you see this again, would be much appreciated.
Champions displaying crossed 'banned' mark in normals game
RADS\projects\lol_air_client\releases\0.0.0.223\de ploy\logs
folder. Find the one with the timestamp closest to when you saw the issue, and post it here. Thanks!