Unable to leave starting fountain (ARURF)

Joined a game that took about 5 minutes to get through the loading screen. When I entered the game as Tahm Kench and bought my initial items, I was unable to move past the top step of the fountain. I tried flashing past the invisible barrier but I was then stuck at the position I flashed to. I recalled back to the top of the fountain and was still stuck. I closed the client and reopened. After I rejoined the game I was able to move freely.