### 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)

prop = memnew(EditorPropertyColor);
				} break;
				case Variant::STRING_NAME: {
					EditorPropertyText *ept = memnew(EditorPropertyText);
					ept->set_string_name(true);
					prop = ept;
				} break;
				case Variant::NODE_PATH: {
					prop = memnew(EditorPropertyNodePath);
				} break;
				case Variant::RID: {
					prop = memnew(EditorPropertyRID);
				} break;
				case Variant::SIGNAL: {
					prop = memnew(EditorPropertySignal);
				} break;
				case Variant::CALLABLE: {
					prop = memnew(EditorPropertyCallable);
				} break;
				case Variant::OBJECT: {
					if (Object::cast_to<EncodedObjectAsID>(value)) {
						EditorPropertyObjectID *editor = memnew(EditorPropertyObjectID);
						editor->setup("Object");
						prop = editor;
					} else {
						EditorPropertyResource *editor = memnew(EditorPropertyResource);
						editor->setup(object.ptr(), prop_name, "Resource");
						editor->set_use_folding(is_using_folding());
						prop = editor;
					}