Why Rito won't disable Riven
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The CC dodge can be reproduced by most champions with a dash/blink. Ezreal can do it most easily (in my opinion)
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The bug is not gamebreaking. If this bug was something hugely abusable and as a result, Riven became ridiculously unfair to fight, Riven would be disabled, and I have proof of this.
To keep this short, back in June 2015, Riven had a bug where if she mashed her Q and AA while recalling, the recall would instantly teleport her to base. Riot saw this, and she was disabled. She did get re-enabled before the bug was fixed though because it was a problem with Riot's systems and they disabled Ranked instead. There's a whole story about it on Nexus, it's called Total Recall, or: That Time We Disabled Ranked
I don't know why Riot doesn't say anything about this, but its most likely again something with their systems, and there probably wouldn't be any way to change this without re-coding her spells, and then even if they did that, the rest of the cast that can replicate this would need to be fixed too
Tl;dr: Riven herself is not bugged, dashing/cc is. Riven is not being given special treatment.
PS: I read your mind while you read this, it says you've never seen a Riven in your games do this enough to actually affect you :^)
PSS: Post other champions that can do this that you know of
Current list: Every champ with a dash hah suckers :^) Edit 1: Just to clear this up, 1. Riven can only do this on her E either immediately before or after pressing her Q. 2. This is only applied to knockups and knockbacks. There is no record (from what I've seen) of her dodging hard CC with this. The exception here is the stun on Nautilus's Dredge Line, but this may be because the stun wouldve worn off already at the end of the dash. 3. This needs to be sweetspotted at the beginning of the dash, my assumption on RIven is the first .1 second when the dash starts up, meaning this bug isn't easy to replicate in a real game as Literally everyone talking about it is making it to be. Ezreal's sweetspot is the beginning of the blink animation till he actually warps, which is longer and easier to replicate. It functions the same way from what I've seen.
Edit 2: Adrian Riven, the guy who discovered this bug found out this applies to everyone with a dash