Can we make Diana's ult no CD like it says or fix her tooltip?

Actually, the info says "...Lunar Rush cooldown is refreshed"

Plus, the way coding probably works is a) the game needs time to identify if target was marked to fulfil the refresh condition and b) the lockout is perhaps so it can remove the Moonlight (de)buff from any other target hit from Cresent Strike, so Diana can't zoom around the battlefield.

So, really, there is no clarity error. And it only takes 1-2 tries to get the hang of how the mechanic works. If anything, the lockout is helpful - ever played Fiora and accidentally blew double lunge on a single minion, rather than using it to lunge from minion -> champion? (Lunge has no lock-out time)

The Cooldown is 0 if you Rush to someone that has Moonlight, if they don't have the debuff, CD is normal. Seems simple to me.

It say's "no cooldown". But the lockout does make sense in terms of the game needing time. But it's really not useful as far as the whole ulting to a minion thing goes, especially when you're a duelist Diana player like me. That's a matter of skill. Hopefully a red can explain.

Having a short lockout time means that you can't accidentally double-cast it, and will have the second one available to use on a different target. Sometimes you don't want to use both charges, because you're planning on using the second to escape or go to a further target or just don't want it to go on CD so you can poke with it; if you can double cast it instantly, you'll get your Damage out slightly faster but you'll often accidentally lose the ability to save it. (sometimes you spam an ability because you're just out of range chasing someone, but don't want it to go off twice)

A tooltip fix for clarity would be the best option tbh. As others have said accidental double casts would suck. Especially if I am laning like against an Orianna. I won't kill her with Q+R+R but I will with Q+R > Q+R+R