collapsible toolbar not collapsing

[moinqureshi-ss]

first of all thanks for this amazing library it's working great but in one of my screens when recycler view is scrolled using fastscroll the CollapsingToolbarLayout is not collapsing and i can not scroll till end using thumb in this case

[randr0id]

Thank you @moinqureshi-ss

Can you provide a video or screenshot of the issue?