Box2D crashes Hazelnut while unloading a scene thats currently being run.

[Markus-included]

Describe the bug

A clear and concise description of what the bug is. A screenshot or copy of the error could be helpful as well.

Make sure your bug can be reproduced with the Hazel Engine and not by your own engine that you're creating alongside with Hazel. For issues with your own engine, we're happy to help you in TheCherno Discord server. Thanks for your understanding.

To Reproduce

Steps to reproduce the behavior:

1. Open up any scene that contains rigidbodies.
2. Run the scene.
3. Open up another scene or create a new scene while still running the scene.

Expected behavior

Box2D throws an exeception at line 910 in b2_world.cpp, which crashes Hazelnut.

Operating system: (please complete the following information)

• OS: win-64
• Version: Windows 10 Pro 21H1