Blurry mirror and glass reflection denoise layer

Hi there! Anyone knows what causes mirror and glass to come out with blurry reflection for denoise layer? I had tried changing denoise to be mild, or even custom and nothing helps. Sometimes it comes out perfect but it is my second model that is like that for unknown reason even though i always use same materials for mirror or glass.

What App are you using for rendering?

Because the face of the mirror is being denoised instead of the things you see in the reflection.
I’m amazed that sometimes it does work like you want it to.

What do the glass and mirror material properties look like? Is it just a single face or does it have thickness?
Anything special about the model? Dumb question: Is it very far from the model origin, or are the extents very large?