UI refresh delay on theme change (android)

Hi guys!
This is the app I'm currently working on [REDACTED]

The app changes its UI automatically when the user changes his device theme between dark/light modes.
That part works great, but there is this detail: While on iOS the change is instantaneous, in Android it takes several seconds to update (it doesn't matter if I run it in a new/fast device)

Both apps (iOS, Android) share the same settings and the website they show is exactly the same.
What could be causing this issue on Android

Thanks in advance!