[Bug] iOS collection view items are misaligned with background

Description

On iOS, it's not possible to align content with the collection view item background, if a background colour is set.

This image for an example of what I mean:

This was produced with this Xaml:

This is only an issue on iOS, not on Android.

I've included a renderer in the iOS solution that hacks a fix in for this. After the fix, the item is displayed correctly:

I believe the issue is caused by the fact that the rendered content is given a bounds with an x of -1 and a y of -1.

Steps to Reproduce

Run the app

Expected Behavior

Background and accent are aligned

Actual Behavior

Background and accent are misaligned

Uncomment out the renderer attribute on iOS to see a hack that works around the bug

Basic Information

• Version with issue:
• Last known good version:
• IDE: Visual Studio for Mac
• Platform Target Frameworks:
  • iOS: 13.6.0.12
• Nuget Packages: Xamarin Forms 4.3.0.991211
• Affected Devices: iOS

Reproduction Link

https://github.com/petermajor/CollectionViewItemAlignmentBug