### 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)

EditorPropertyRangeHint hint = _parse_range_hint(p_hint, p_hint_text, 1, true);
				editor->setup(hint.min, hint.max, hint.step, hint.hide_slider, hint.or_greater, hint.or_less, hint.suffix);
				return editor;
			}
		} break;
		case Variant::FLOAT: {
			if (p_hint == PROPERTY_HINT_EXP_EASING) {
				EditorPropertyEasing *editor = memnew(EditorPropertyEasing);
				bool positive_only = false;
				bool flip = false;
				const Vector<String> hints = p_hint_text.split(",");
				for (int i = 0; i < hints.size(); i++) {
					const String hint = hints[i].strip_edges();
					if (hint == "attenuation") {
						flip = true;
					}
					if (hint == "positive_only") {
						positive_only = true;
					}
				}
				editor->setup(positive_only, flip);
				return editor;
			} else {
				EditorPropertyFloat *editor = memnew(EditorPropertyFloat);
				EditorPropertyRangeHint hint = _parse_range_hint(p_hint, p_hint_text, default_float_step);
				editor->setup(hint.min, hint.max, hint.step, hint.hide_slider, hint.exp_range, hint.or_greater, hint.or_less, hint.suffix, hint.radians);
				return editor;
			}
		} break;
		case Variant::STRING: {