GAMEPLAY - Fiora is not stunning certain champions after Riposte

This is a pretty easy one to replicate 100% of the time. Fiora at the moment can not stun Renekton W and Naut AA if she ripostes the CC, they are just slowed instead.

There may be more cases but as the moment these are the two I know.

Any word on if Riot is aware of this? Since the latest patch showed no fixes on the issue.