i think there is a similar issue based on android 30 and below.
If you try to inspect your code with safari technology preview and disable position absolute and display flex in your .ion-page class, something will appear.
sooo weird.
check here: https://forum.ionicframework.com/t/ionic-6-default-project-white-screen-on-android-30-or-below-when-using-prod/228087/8
i think we need the help of the ionic staff
as temporary fix, if you add this to your ion-page class:
height: 100%;
width: 100%;
it works again