Champions can continue to go back if shielded while taking damage

https://my.mixtape.moe/wpywaw.webm

This clearly shows a game in which I shield my ADC and he continues to go back despite being hit by Lee Sin's Resonating Strike (Q). I have done some research and this is definitely not supposed to happen, but has been reported as a bug before. Only posting in case Riot has not seen this particular situation/other posts about this same thing.