### 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)

String prop_name;
			Variant key;
			Variant value;
			if (i < amount) {
				prop_name = "indices/" + itos(i + offset);
				key = dict.get_key_at_index(i + offset);
				value = dict.get_value_at_index(i + offset);
			} else if (i == amount) {
				prop_name = "new_item_key";
				value = object->get_new_item_key();
			} else if (i == amount + 1) {
				prop_name = "new_item_value";
				value = object->get_new_item_value();
			}
			EditorProperty *prop = nullptr;
			switch (value.get_type()) {
				case Variant::NIL: {
					prop = memnew(EditorPropertyNil);
				} break;
				
				case Variant::BOOL: {
					prop = memnew(EditorPropertyCheck);
				} break;
				case Variant::INT: {
					EditorPropertyInteger *editor = memnew(EditorPropertyInteger);
					editor->setup(-100000, 100000, 1, false, true, true);
					prop = editor;
				} break;
				case Variant::FLOAT: {
					EditorPropertyFloat *editor = memnew(EditorPropertyFloat);