Scrollview: Scrollability of nested scrollviews broken if gesture recognizer added

Description

Nested Scrollvies + GestureRecognizer: ScrollView dont scroll anymore:

    <ScrollView
        HorizontalOptions="FillAndExpand"
        VerticalOptions="FillAndExpand"
        Orientation="Vertical">

        <StackLayout
	        HorizontalOptions="FillAndExpand"
	        VerticalOptions="FillAndExpand">

	        <ScrollView
		        Orientation="Horizontal"
		        HorizontalOptions="FillAndExpand"
		        VerticalOptions="Start">

		        <StackLayout
    				WidthRequest="3000"
        			HeightRequest="200"
	        		BackgroundColor="Aqua"/>
	        </ScrollView>

    		<StackLayout
        		HorizontalOptions="FillAndExpand"
	        	HeightRequest="800"
		        BackgroundColor="Fuchsia">
    			<StackLayout.GestureRecognizers>
        			<TapGestureRecognizer />
	        	</StackLayout.GestureRecognizers>
    		</StackLayout>
    	</StackLayout>
    </ScrollView>

Steps to Reproduce

1. open app
2. scroll the fuchsia scrollview (vertical) up & down -> works
3. scroll the upper (horizontal) scrollview left & right -> works
4. after that, scroll the fuchsia scrollview (vertical) again -> doesn't work

Expected Behavior

Vertical scrollview should scroll

Actual Behavior

Vertical scrollview doesn't scroll

Basic Information

• Version with issue: >= 3.5
• Last known good version: 3.4
• IDE: Visual Studio 2019
• Platform Target Frameworks: Android
  • Android: 9.0
• Android Support Library Version: v28.0.0.1
• Nuget Packages: standard
• Affected Devices: all

Seems that the update of Xamarin.Forms.Core.IScrollViewController.cs and Xamarin.Forms.Core.ScrollView.cs (LayoutAreaOverride) causes the issues.

Reproduction Link

ScrollIssue.zip