Implicit animations don't work when exiting full screen mode while performing page navigation.

[dpaulino]

Describe the bug If you are exiting full screen mode while performing a page navigation, the implicit animations on the destination page do not reliably trigger. This leads to UI elements that have 0 opacity or other strange states (because their animations didn't trigger).

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Clone this repo: https://github.com/dpaulino/BrokenImplicitAnimation
2. Follow the steps in the readme

Expected behavior

We expect the implicit animations to reliably trigger when exiting full screen mode while performing page navigation.

Screenshots

Please watch this video showing the bug: https://streamable.com/txogay. This video is using the app repo that is linked above in the reproduction steps.

Version Info

NuGet package version: Not using WinUI, but it's using composition APIs.

Windows app type:	UWP	Win32
Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)	Yes
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

[dpaulino]

Note that an interesting workaround is to disable page animation when navigating back. This workaround is specified in the repo I linked. Is this by design? What's the official story here? I will add that I went 6 months not knowing about this workaround and being very confused why my UI elements have been disappearing randomly.

[StephenLPeters]

@jeffstall FYI

[dpaulino]

Bump