DatePicker Does Not Update Its Format When the Culture Is Changed at Runtime

[TamilarasanSF4853]

Description

When changing the culture at runtime, the DatePicker control does not update its displayed date format to match the new culture. However, if we select a date from the DatePicker, it then updates the displayed date to use the selected culture.

Screen.Recording.2025-06-20.at.4.37.10.PM.mov

Steps to Reproduce

1. Run the attached sample: TestingApp.zip
2. Observe the DatePicker when changing the culture.
3. Try selecting a date from the DatePicker after changing the culture.

Link to public reproduction project repository

No response

Version with bug

10.0.0-preview.4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android, iOS, macOS, Windows

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

This issue has been verified in Visual Studio Code 1.101.0 with .NET MAUI versions 10.0.0-preview, 4, 9.0.80, and 9.0.0. It can be reproduced on the Android, iOS, MacCatalyst, and Windows platforms.