Why CoordinatorLayout leaves a margin at the bottom?

Question

When I use layout_height="wrap-content" in the CorrdinatorLayout, there is a margin at the bottom. Here's my code:

    <androidx.coordinatorlayout.widget.CoordinatorLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         xmlns:tools="http://schemas.android.com/tools"
         android:id="@+id/activity_details_coordinator_layout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:animateLayoutChanges="true"
         android:background="@color/ui_view_primary_background"
         android:orientation="vertical">

         <include layout="@layout/activity_item_details_appbar_v2"/>

         <androidx.core.widget.NestedScrollView
              android:id="@+id/scrollview_transaction_details_layout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_gravity="fill_vertical"
              app:layout_behavior="@string/appbar_scrolling_view_behavior"
              android:layout_marginBottom="?attr/actionBarSize"
              android:background="?attr/ui_v2_color_neutral_100">

             <LinearLayout
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:orientation="vertical">

                  <LinearLayout
                        android:id="@+id/transaction_summary"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:animateLayoutChanges="true"
                        android:orientation="vertical"/>

                  </LinearLayout>
            </androidx.core.widget.NestedScrollView>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

When i change CoordinatorLayout height to match_parent, it works fine. But, i want to have keep it as wrap_content. I have seen many answers that says add android:fitsSystemWindows="true"to the coordinatorlayout. But, for me, its not working. Any idea why is this happening like this? This is the screenshot of my screen. Black area is the AppBarLayout and area marked in red is the unwanted margin. Any idea on how to fix this? Thanks