### Godot version

4.0 Beta10

### System information

Ubuntu 22.04 (Tuxedo OS)

### Issue description

After importing an *.obj file as a scene, if you click on the mesh in the import settings Godot crashes.

![Screenshot from 2022-12-24 14-38-23](https://user-images.githubusercontent.com/25522325/209452619-3c0ed61b-deaa-4fb6-8ff5-5aa11ff4ed33.png)

I the above screenshot, clicking in the circled area will crash Godot.

### Steps to reproduce

Import .obj file into a project.
Select the file.
Go to import setting.
Change OBJ As Mesh to Scene.
Click Reimport.
Click Save Scenes, Re-Import, and Restart.
Once restarted, open the advanced import settings on the object.
Click the are circled in the description, or in the meshes tab.

### Minimal reproduction project

N/A

Specifically, I lack the distribution rights of the .obj files I am using.  Any .obj file should do, this happened to me on at least 4 different .obj files.
Vector<String> v = l.split(" ", false);
			ERR_FAIL_COND_V(v.size() < 3, ERR_FILE_CORRUPT);
			Vector2 uv;
			uv.x = v[1].to_float();
			uv.y = 1.0 - v[2].to_float();
			uvs.push_back(uv);
		} else if (l.begins_with("vn ")) {
			
			Vector<String> v = l.split(" ", false);
			ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
			Vector3 nrm;
			nrm.x = v[1].to_float();
			nrm.y = v[2].to_float();
			nrm.z = v[3].to_float();
			normals.push_back(nrm);
		} else if (l.begins_with("f ")) {
			
			Vector<String> v = l.split(" ", false);
			ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
			
			Vector<String> face[3];
			face[0] = v[1].split("/");
			face[1] = v[2].split("/");
			ERR_FAIL_COND_V(face[0].size() == 0, ERR_FILE_CORRUPT);
			ERR_FAIL_COND_V(face[0].size() != face[1].size(), ERR_FILE_CORRUPT);
			for (int i = 2; i < v.size() - 1; i++) {
				face[2] = v[i + 1].split("/");
				ERR_FAIL_COND_V(face[0].size() != face[2].size(), ERR_FILE_CORRUPT);
				for (int j = 0; j < 3; j++) {
					int idx = j;