Form Sheet does not react to updated `sheetAllowedDetents` values (Android only)

[SimpleCreations]

Description

On Android, when using setOptions to change sheetAllowedDetents, the sheet does not snap to new positions automatically, unlike how it does on iOS.

In my actual use case, the first detent is dynamically calculated based on layout metrics of parts of the content inside the sheet, and there doesn't seem to be a way to make it update the current position on Android.

Android	iOS
untitled.webm	Simulator.Screen.Recording.-.iPhone.11.Pro.-.2026-04-21.at.18.40.03.mov

Steps to reproduce

import { Button, View } from 'react-native';
import { SafeAreaProvider } from 'react-native-safe-area-context';
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';

const Stack = createNativeStackNavigator();

const HomeScreen = ({ navigation }) => (
  <Button
    title="Open form sheet"
    onPress={() => navigation.navigate('Sheet')}
  />
);

const SheetScreen = ({ navigation }) => (
  <View style={{ padding: 24 }}>
    <Button
      title="Change detent"
      onPress={() => {
        navigation.setOptions({ sheetAllowedDetents: [Math.random() * 0.75 + 0.25] });
      }}
    />
  </View>
);

const App = () => (
  <SafeAreaProvider>
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Home" component={HomeScreen} />
        <Stack.Screen
          name="Sheet"
          component={SheetScreen}
          options={{ presentation: 'formSheet', sheetAllowedDetents: [0.5] }}
        />
      </Stack.Navigator>
    </NavigationContainer>
  </SafeAreaProvider>
);

export default App;

Snack or a link to a repository

https://github.com/SimpleCreations/SEE_REPRO_ABOVE_sorry_bot

Screens version

4.24.0

React Native version

0.85.2

Platforms

Android

JavaScript runtime

Hermes

Workflow

React Native (without Expo)

Architecture

Fabric (New Architecture)

Build type

Debug mode

Device

Android emulator

Device model

No response

Acknowledgements

Yes

[kmichalikk]

HI @SimpleCreations
I can confirm this behavior. For now, the code doesn't allow to change the detents at runtime. We actually had planned to research the possibility to update detents at runtime (https://github.com/software-mansion/react-native-screens-labs/issues/648) but other things required attention. I took some time to try and force detent update in a custom property setter and while it is promising, a lot of work is still to be done. I can't tell if or when we're going to implement this.

cc @kkafar