MAUI Incorrect Theme when Resuming iOS App

[dinisvieira]

Description

Maui is using Light Theme instead of Dark Theme on iOS when resuming App (for example after "sharing a link" to a browser) when the OS is set to use Dark Theme (and the app was showing Dark Theme before resuming.
Application.Current.RequestedTheme is also returning the incorrect theme in these scenarios on App.OnResume.

Steps to Reproduce

PS: It's sometimes needed to repeat Share process to reproduce the bug.

Steps to Reproduce with the reproduction repo:

1. Run App on iOS Device with the OS Theme set to Dark
2. Click on the Button and Share using a Browser
3. Go Back to App
4. Repeat from step 2 (until the App is showing Light Theme)

Result:

App shows Light Theme instead of Dark

Expected:

App should always use Dark Theme (which is the one used and requested by the OS)

Link to public reproduction project repository

https://github.com/dinisvieira/maui-os-dark-theme-bug/tree/main

Version with bug

8.0.3

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS 17.3 (possibly others)

Did you find any workaround?

No workarounds that wouldn't have some drawback. Application.Current.RequestedTheme is also returning the incorrect theme.

Relevant log output

No response

[drasticactions]

Duplicate of #19614