What feature exactly conflicts between "combat behavior improved" and "FNIS" ?

[ckhong87]

I searched and ppl saying CBI and TK dodge with FNIS (or FNIS itself) are not compatible. But I used them together and don't know exactly what point is the problem.

I could roll forward with TK dodge while fast blocking motion from CBI working properly. I saw some ppl saying that It's the problem only for 1st person view.

So I'm wandering if I just use CBI for blocking and 2 handed behavior improve, no problem there with FNIS?

cause I tried to give up FNIS but even the racemenu and many mods need it. I just use TK dodge for simple setting (which press dodge key for dodge backward)

and I also saw installing FNIS affects on 3rd person view motion? for combat behavior improved.

please make me sure about the problem with using CBI and FNIS together.