Honda — Replacement of wheel bearing under warranty

I had purchased honda wr-v petrol top model from mehsana landmark honda in march 2018.
My car number gj02cl 7494.

In left side rare wheel bearing is damaged and there is something noisy while driving.
My car is under warranty but landmark honda showroom said due to fitment of cng, car bearing will not replaced under warranty.

Also alternate fuel kit is government approved and my rc book updated with bi fuel also i had pay additional premium for that.

I had replaced fuel pump in under warranty before six month ago at that time my car also cng.

Then why right now it will not covered under warranty.