UWP doesn't handle IME

Hi everyone.

I want to offer Chinese support for my application and made the corresponding modifications to the layout and text input handling.

After making those modifications, my macOS application works as expected, but my Windows application (UWP build) ignores what language layout is supposed to be active and behaves without composing the keystrokes.

Has anyone successfully deployed an UWP app that gets text composition from any IME?
Thanks in advance.