Resizing Grid in Sample App causes content flashes

[Kyaa-dost]

Describe the bug

When adjusting or resizing the grid in Sample App the content flashes continuously

Steps to Reproduce

• [x] Can this be reproduced in the Sample App? (Either in a sample as-is or with new XAML pasted in the editor.) If so, please provide custom XAML or steps to reproduce. If not, let us know why it can't be reproduced (e.g. more complex setup, environment, dependencies, etc...)

Steps to reproduce the behavior:

1. Open Windows Community Toolkit Sample App
2. Click on any sample and select XAML
3. Try resizing the grid now and the content will flash

Expected behavior

There should not be any flashes when resizing the grid

Screenshots

https://user-images.githubusercontent.com/35208324/104776415-e6f72200-572e-11eb-9ef9-c990fa31db0c.mp4

Environment

NuGet Package(s): 

Package Version(s): 

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [x] May 2019 Update (18362)
- [ ] May 2020 Update (19041)
- [ ] Insider Build (build number: )

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [x] May 2019 Update (18362)
- [ ] May 2020 Update (19041)
- [ ] Insider Build (xxxxx)

Device form factor:
- [x] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [x] 2019 (version: ) 
- [ ] 2019 Preview (version: )

Additional context

Add any other context about the problem here.

[ghost]

Hello Kyaa-dost, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌

[michael-hawker]

This may be an issue with the UWP Monaco Wrapper itself, it being wrapped in a Pivot, or something else in the Sample App. Since we want to do work on the Sample App in 7.1, we can address it then.