[Bug]: Crash on iOS: swift_isUniquelyReferenced_nonNull_native when using ChangeLineOffsetsShapeAnimator and MovePointShapeAnimator

Mapbox Implementation

Mapbox

Mapbox Version

11.12.5

React Native Version

0.74.7

Platform

iOS

@rnmapbox/maps version

10.1.38

Standalone component to reproduce

// ⚠️ NOT directly reproducible, example only.
// Crash happens in production when using experimental animators.

import React from 'react';
import Mapbox, {
  MapView,
  ShapeSource,
  LineLayer,
  Camera,
  __experimental
} from '@rnmapbox/maps';

const line = {
  type: 'LineString',
  coordinates: [
    [-74.00597, 40.71427],
    [-74.00697, 40.71527],
  ],
};

export default function BugReportExample() {
  // Example of using animators involved in crashes:
  const moveAnimator = new __experimental.MovePointShapeAnimator([-74.00597, 40.71427]);
  const offsetAnimator = new __experimental.ChangeLineOffsetsShapeAnimator({
    coordinates: line.coordinates,
    startOffset: 0,
    endOffset: 0,
  });

  // In production, we call moveTo()/setEndOffset() repeatedly during animation

  return (
    <MapView style={{flex: 1}}>
      <Camera centerCoordinate={[-74.00597, 40.71427]} zoomLevel={14} />
      <ShapeSource id="line-source" shape={offsetAnimator}>
        <LineLayer id="line-layer" />
      </ShapeSource>
      <ShapeSource id="point-source" shape={moveAnimator} />
    </MapView>
  );
}

Observed behavior and steps to reproduce

We’re seeing a production crash on iOS when frequently updating a ShapeSource via:

• __experimental.MovePointShapeAnimator.moveTo
• __experimental.ChangeLineOffsetsShapeAnimator.setEndOffset

The crash is not currently reproducible in local/dev environments.
It has only occurred on one production device so far, but the stack trace is consistent and always points inside Mapbox native code during updateGeoJSONSource.

Crash Stack Trace (same as screenshot):

Expected behavior

No response

Notes / preliminary analysis

No response

Additional links and references

No response

Start by tracing MovePointShapeAnimator.moveTo and ChangeLineOffsetsShapeAnimator.setEndOffset through the iOS update path that reaches updateGeoJSONSource, using the provided crash stack trace and reproduction example. Repeated updates should no longer produce the swift_isUniquelyReferenced_nonNull_native crash on iOS, with the behavior verified under animation-like update frequency.