[Bug] ControlTemplate custom controls not rendered

[LegendaryB]

Description

A custom control can't be placed in a ControlTemplate. It will not be rendered or visible. Also the upper parent element does not list it as a child.

Steps to Reproduce

1. Create Control Template for a ContentPage which contains a custom control
2. Assign it
3. Custom control not rendered / displayed

Expected Behavior

The custom control is displayed.

Actual Behavior

The custom control is not displayed.

Basic Information

• Version with issue:
• Last known good version: - ´
• IDE: MS Visual Studio 2019 Version 16.7.5
• Platform Target Frameworks:
  • iOS: 14
  • Android: 9
• Nuget Packages: Xamarin.Forms 4.8.0.1451, Xamarin.Essentials 1.5.3.2

Reproduction Link

ControlTemplate.zip

Workaround

Did not find any