### Godot version

4.0-rc6

### System information

Fedora 37, Mesa Intel ADL GT2

### Issue description

Code that works as expected at runtime fails with Nil references to (assigned) exported vars in the editor:

![tool_global_position_error](https://user-images.githubusercontent.com/364501/222031460-ffb1ecbd-5175-4a42-8470-25285ba5f821.png)


### Steps to reproduce

Try to access the `global_position` of a `Node3D` that's assigned to an exported var.

See that it works at runtime.

See that it errors in the editor with:

> Invalid get index 'global_position' (on base: 'Nil').

### Minimal reproduction project

[tool_test.zip](https://github.com/godotengine/godot/files/10856640/tool_test.zip)

layer_type = p_layer_type;
	int layer_group_size = 0;
	int layer_count = 0;
	switch (p_layer_type) {
		case LAYER_RENDER_2D: {
			basename = "layer_names/2d_render";
			layer_group_size = 5;
			layer_count = 20;
		} break;
		case LAYER_PHYSICS_2D: {
			basename = "layer_names/2d_physics";
			layer_group_size = 4;
			layer_count = 32;
		} break;
		case LAYER_NAVIGATION_2D: {
			basename = "layer_names/2d_navigation";
			layer_group_size = 4;
			layer_count = 32;
		} break;
		case LAYER_RENDER_3D: {
			basename = "layer_names/3d_render";
			layer_group_size = 5;
			layer_count = 20;
		} break;
		case LAYER_PHYSICS_3D: {
			basename = "layer_names/3d_physics";
			layer_group_size = 4;
			layer_count = 32;
		} break;