I was unable to place bonfire in fireplace. It happen always in specific house called "land village pub" (dayz xam map) on map Chernarus near Chernaya Polana, which have fireplace on first floor (see images).

Normally in other houses when you have bonfire in hands and you are close to fireplace and looking in fireplace, option "place fireplace" pops out. In this house this option never pops out and you are unable to place bonfire in fireplace.