Vi Q bug with Cassiopeia's grounded effect [GAMEPLAY]

In game if Vi is grounded by Cassiopeia while charging her Q she is unable to finish it and dash, which makes sense. However, even after leaving the grounded pool you cant finish the Q dash and are stuck charging it until it fades away. So again that's beginning the Q charge, getting grounded by Cassiopeia, walking out of the grounded pool, and then still not being able to finish the dash. This happened to me multiple times in my previous placement game however i regrettably didn't take any screenshots or videos of it.