Vyper can't use Petrifying Bola while crouching AND moving backwards (S key)

[leatherby.b]

You can't cast Vyper's ult while Holding crouch (Ctrl) + backwards (S). Strangely you can still use her Screwjab Dagger, Venom, and even snowballs. You don't even need to be sliding. Crouch walking backwards makes it impossible to throw your 4.

I found this out during a match where was sliding downstairs while being chased by a Warden and tried to stun him out of his ult channelling. I hit "4" several times while sliding backwards and it didn't work. It got me killed. It happened again the same match when I needed to stun Lash while running away.

 

[steventheeven3]

Works fine for me in sandbox. Do you happen to have a video or a match id with a time stamp?

Also does this happen consistently if you test it in sandbox?

 

[leatherby.b]

I am mashing "4" to ult this entire clip. It's only when holding crouch, "S", and trying to ult.