Re-registering AppInstance causes Key to be invalid

[stevenbrix]

Describe the bug

If you have an app instance which unregisters itself, and then calls AppInstance.findOrRegisterKey it "succesfully" registers, but then the Key is not valid (it returns ""). This means that a subsequent process will come along and call AppInstance.findOrRegiserKey, which will end up returning null

Steps to reproduce the bug

1. call AppInstance.FindOrRegisterKey("myKey")`
2. call AppInstance.GetCurrent().UnregisterKey
3. call AppInstance.FindOrRegisterKey("myKey")
4. launch second instance of application, notice that the call from step (1) will return null

Expected behavior

FindOrRegisterKey will return the proper instance

Screenshots

No response

NuGet package version

Windows App SDK 1.5.3: 1.5.240428000

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

No response

Additional context

No response