Jumpy behaviour when setting sheetInitialDetentIndex to other then 0.

[blytung]

Description

When im using sheetInitialDetentIndex and set it to another value then 1, the formSheet is behave jumpy, it hard to stick to the anchor.

Here how it is
https://github.com/user-attachments/assets/c79b61cd-22e3-406d-8139-e485fa01f18e

`
<RootStack.Screen
name="Favorites"
component={Favorites}
options={{
presentation: 'formSheet',
headerShown: true,
title: '',
sheetAllowedDetents: [0.2, 0.5, 0.99],
gestureEnabled: true,
sheetInitialDetentIndex: 2,
sheetLargestUndimmedDetentIndex: 'last',
sheetCornerRadius: 24,

          contentStyle: {
            backgroundColor: COLORS.primaryBackground,
          },
          unstable_screenStyle: {
            backgroundColor: COLORS.primaryBackground,
          },
        }}
      />

`

Expected behaviour:

Simulator.Screen.Recording.-.iPhone.16.Pro.-.2024-11-27.at.12.04.21.mp4

`
<RootStack.Screen
name="Favorites"
component={Favorites}
options={{
presentation: 'formSheet',
headerShown: true,
title: '',
sheetAllowedDetents: [0.2, 0.5, 0.99],
gestureEnabled: true,
sheetInitialDetentIndex: 0,
sheetLargestUndimmedDetentIndex: 'last',
sheetCornerRadius: 24,

          contentStyle: {
            backgroundColor: COLORS.primaryBackground,
          },
          unstable_screenStyle: {
            backgroundColor: COLORS.primaryBackground,
          },
        }}
      />

`

Steps to reproduce

1. set the sheetInitialDetentIndex to a value other then 0.
2. using formSheet

Snack or a link to a repository

snack

Screens version

4.0.0

React Native version

0.75.0

Platforms

iOS

JavaScript runtime

None

Workflow

Expo bare workflow

Architecture

Fabric (New Architecture)

Build type

Debug mode

Device

Real device

Device model

iPhone 14 Pro

Acknowledgements

Yes

[blytung]

Do you need any more info about this or do you understand the issue? :)

[kkafar]

Hey, thanks for reporting. I clearly see the issue and must admit I'm surprised by it as I remember fixing the exactly same one few months back. Some regression must have happened, will look into this.

[blytung]

Hey, thanks for reporting. I clearly see the issue and must admit I'm surprised by it as I remember fixing the exactly same one few months back. Some regression must have happened, will look into this.

Thats fantastic. We appreciate all the work you guys put into this!