Ionic 5 Media (prefers-color-scheme) not working

I use a new Ionic app recently created with no custom CSS.

My problem is the @media not working for dark/light mode.

My Android phone is on dark mode, and the @media dark has no effect.

@media (prefers-color-scheme: light) {}

The app is on full light mode.

My iPhone works with light/dark mode with same code.