onBindViewHolder.kt

override fun onBindViewHolder(
    holder: FragmentViewHolder,
    position: Int,
    payloads: MutableList<Any>
) {
    if (payloads.isNotEmpty()) {
        val tag = "f" + holder.itemId
        val fragment = activity.supportFragmentManager.findFragmentByTag(tag)
        // safe check, but fragment should not be null here
        if (fragment != null) {
            (fragment as PagerFragment).setValue(items[position].value)
        } else {
            super.onBindViewHolder(holder, position, payloads)
        }
    } else {
        super.onBindViewHolder(holder, position, payloads)
    }
}