How to code split Map component in react-map-gl? - mapbox-gl-js

Question

I'm trying to codesplit a react-map-gl Map component into its own chunk using Lazy,Suspense.
This is my component.
import 'mapbox-gl/dist/mapbox-gl.css'
import React, {lazy, Suspense} from 'react'
const Map = lazy(() => import('react-map-gl'))
const MAPBOX_TOKEN = process.env.REACT_APP_MAPBOX_TOKEN
const MAP_STYLE = process.env.REACT_APP_MAPBOX_STYLE_DARK
export default function MapboxMap() {
const viewport = {
latitude: 37.805,
longitude: -122.447,
zoom: 15.5
}
return <div style={{width: '500px', height: '500px', position: 'relative'}}>
<Suspense fallback={<div>Loading...</div>}>
<Map
initialViewState={viewport}
mapboxAccessToken={MAPBOX_TOKEN}
mapStyle={MAP_STYLE}
styleDiffing
/>
</Suspense>
</div>
}
and this is my package.json
{
"name": "compression-test",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-map-gl": "^7.0.10",
"react-scripts": "^5.0.0"
},
"scripts": {
"start": "react-scripts --openssl-legacy-provider start",
"build": "react-scripts --openssl-legacy-provider build",
"analyze": "source-map-explorer 'build/static/js/*.js'"
},
"eslintConfig": {
"extends": [
"react-app",
"react-app/jest"
]
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"source-map-explorer": "^2.5.2"
}
}
But as you can see from the source-map-explorer screenshot, Mapbox is still in the main chunk.
What am I doing wrong here? Has anyone else successfully tried to use the react-map-gl library and
managed to split it into its own chunk?