some bug with Modal and Portal

### Current behaviour
The modal may cause a quick flash; setting dismissable to false does not resolve this issue.
Additionally, the modal can result in an unsmooth exit when used with react-native-maps.
Moreover, when attempting to embed a Portal into a List on iOS, the entire component sometimes becomes hidden, although this issue does not occur on Android.
### Expected behaviour

### How to reproduce?

### Preview

### What have you tried so far?

### Your Environment

| software | version
| --------------------- | -------
| ios | x
| android | x
| react-native | x.x.x
| react-native-paper | x.x.x
| node | x.x.x
| npm or yarn | x.x.x
| expo sdk | x.x.x

Start by reproducing the reported Modal and Portal behavior on iOS, including the quick flash, unsmooth exit with react-native-maps, and hidden Portal inside a List. Compare the behavior with Android and use the reported environment details to narrow the cause; done means these iOS cases behave smoothly and the Portal remains visible.

Written by the indexing model from the issue text.