[iOS, Mac] Picker title is not displayed again when SelectedIndex is set to -1

[TamilarasanSF4853]

Description

When a Picker item is selected, setting the SelectedIndex back to -1 does not restore the original title. Instead, the Picker continues to display the previously selected item, and the title is not shown as expected.

Android	iOS
Screen.Recording.2025-07-07.at.12.22.26.PM.mov	Screen.Recording.2025-07-07.at.12.25.53.PM.mov

Steps to Reproduce

1. Run the attached sample SampleApp.zip
2. Observe the Picker's Title behavior on iOS and macOS devices.

Link to public reproduction project repository

No response

Version with bug

9.0.81 SR8.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS, macOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

This issue has been verified in Visual Studio Code 1.101.2 with .NET MAUI versions 9.0.81 & 9.0.0. It can be reproduced on the iOS and Mac platforms.