ESM packages (@react-leaflet/core) need to be imported.

[ktranish]

Bug report in v4

Before opening an issue, make sure to read the contributing guide and understand this is a bug tracker, not a support platform.

Please make sure to check the following boxes before submitting an issue.\ Issues opened without using this template will be closed unless they have a good reason not to follow this template.

• [x] All peer dependencies are installed: React, ReactDOM and Leaflet.
• [x] Using the latest version of React and ReactDOM v18.
• [x] Using the supported version of Leaflet (v1.8.0 minimum) and its corresponding CSS file is loaded.
• [x] Using the latest v4 version of React-Leaflet.
• [ ] The issue has not already been reported.
• [ ] Make sure you have followed the quick start guide for Leaflet.
• [ ] Make sure you have fully read the documentation and that you understand the limitations.

Expected behavior

This occured after upgrading to next.js 13.4.20

Actual behavior

Please describe.

Steps to reproduce

Please provide the simplest example possible to reproduce the issue, based on this StackBlitz.