[Android] RNGH's LongPress Detection disrupts ScrollView (and AndroidX.ViewPager2, likely any Scrollable?) Swipe Gesture

[DmitriyGalyanov]

Description

I initially reported this Issue in react-native-pager-view, but already closed as I found it's not scoped to PagerView exclusively

Starting RNGH LongPress while scrolling non-RNGH Scrollable disrupts Scrollable Control

Possibly it disrupts any long-lasting non-RNGH Gesture, I didn't check yet

Steps to reproduce

1. Start swiping through ReactNative.ScrollView with pagingEnabled set to true (or react-native-pager-view.PagerView, which uses AndroidX.ViewPager2 under the Hood)
2. LongPress at a ReactNativeGestureHandler's GestureDetector configured to handle LongPresses
3. Swipe Gesture loses Control over Scrolling, but Scrollable doesn't recognize it

• in case of AndroidX.ViewPager2 its ViewPager2.OnPageChangeCallback.onPageScrollStateChanged doesn't get called AND Pager stays in dragging State, not settling (till next Swipe Gesture or Tab Press)
• in case of ReactNative.ScrollView its onScrollEndDrag doesn't get called AND Snap-to-Page doesn't occur (till next Swipe Gesture)

[Videos are below]

A link to a Gist, an Expo Snack or a link to a repository based on this template that reproduces the bug.

In first Repro I'm using React Navigation's MaterialTopTabNavigator for simplicity, but Issue lays in ViewPager2
In second Repro I'm using ReactNative.ScrollView

Messages are shown for LongPresses to be easily noticeable, LongPress' Handlers might be empty

Repro with PagerView

FILE.2026-01-14.18.36.41.mp4

Repro with ReactNative.ScrollView

FILE.2026-01-15.15.04.47.mp4

Gesture Handler version

2.27.2

React Native version

0.80.2

Platforms

Android

JavaScript runtime

Hermes

Workflow

React Native (without Expo)

Architecture

New Architecture (Fabric)

Build type

None

Device

Real device

Device model

Pixel 6a (Android 16)

Acknowledgements

Yes

[DmitriyGalyanov]

I've tried ReactNative.ScrollView and Reanimated.ScrollView (which uses ReactNative.ScrollView under the Hood) in same Scenario (replaced PagerView with ScrollView with pagingEnabled) – result is the same – Swipe Gesture loses Control

But ReactNativeGestureHandler.ScrollView works as expected (Recognizer begins, but doesn't start, thus not interrupting Swipe)

Seems like ViewPager has nothing to do with it, as it's an Issue with RNGH and Native Communication (?)