### 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)

case PROPERTY_HINT_LAYERS_2D_PHYSICS:
						lt = EditorPropertyLayers::LAYER_PHYSICS_2D;
						break;
					case PROPERTY_HINT_LAYERS_2D_NAVIGATION:
						lt = EditorPropertyLayers::LAYER_NAVIGATION_2D;
						break;
					case PROPERTY_HINT_LAYERS_3D_RENDER:
						lt = EditorPropertyLayers::LAYER_RENDER_3D;
						break;
					case PROPERTY_HINT_LAYERS_3D_PHYSICS:
						lt = EditorPropertyLayers::LAYER_PHYSICS_3D;
						break;
					case PROPERTY_HINT_LAYERS_3D_NAVIGATION:
						lt = EditorPropertyLayers::LAYER_NAVIGATION_3D;
						break;
					case PROPERTY_HINT_LAYERS_AVOIDANCE:
						lt = EditorPropertyLayers::LAYER_AVOIDANCE;
						break;
					default: {
					} 
				}
				EditorPropertyLayers *editor = memnew(EditorPropertyLayers);
				editor->setup(lt);
				return editor;
			} else if (p_hint == PROPERTY_HINT_OBJECT_ID) {
				EditorPropertyObjectID *editor = memnew(EditorPropertyObjectID);
				editor->setup(p_hint_text);
				return editor;
			} else {
				EditorPropertyInteger *editor = memnew(EditorPropertyInteger);