Page.IsBusy activity idicators gets stuck/causes multiple to be displayed

[MarcelStommel]

Description

When a page with IsBusy = true is navigated back from, the activity indicator stays displayed and if another page with IsBusy = true is navigated to, another activity indicator is layered on top. I expect the activity indicator to disappear when navigating away, thereby also preventing multiple activity indicators stacked on top of each other.

Steps to Reproduce

1. Start the public reproduction project and navigate to the second page using the button.
2. Toggle IsBusy using the button and navigate back using either the device's back button or the back button in the toolbar
3. The activity indicator will stay active and now display on the first
4. Going to the second page and toggling IsBusy again will layer another activity indicator on top of the existing one

I kinda expect the activity indicator to disappear when the page is navigated away from

Link to public reproduction project repository

https://github.com/MarcelStommel/IsBusyExample

Version with bug

8.0.21 SR4.1

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 11

Did you find any workaround?

Setting IsBusy = false in the OnBackButtonPressed method makes the activity indicator disappear like expected

Relevant log output

No response

[github-actions]

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[Zhanglirong-Winnie]

This issue has been verified using Visual Studio 17.11.0 Preview 4.0(8.0.61&8.0.21&8.0.10). Can repro on android platform.