### 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)

text->set_secret(p_enabled);
}
void EditorPropertyText::set_placeholder(const String &p_string) {
	text->set_placeholder(p_string);
}
void EditorPropertyText::_bind_methods() {
}
EditorPropertyText::EditorPropertyText() {
	HBoxContainer *hb = memnew(HBoxContainer);
	add_child(hb);
	text = memnew(LineEdit);
	hb->add_child(text);
	add_focusable(text);
	text->set_h_size_flags(SIZE_EXPAND_FILL);
	text->connect("text_changed", callable_mp(this, &EditorPropertyText::_text_changed));
	text->connect("text_submitted", callable_mp(this, &EditorPropertyText::_text_submitted));
}
void EditorPropertyMultilineText::_set_read_only(bool p_read_only) {
	text->set_editable(!p_read_only);
	open_big_text->set_disabled(p_read_only);
}
void EditorPropertyMultilineText::_big_text_changed() {
	text->set_text(big_text->get_text());
	emit_changed(get_edited_property(), big_text->get_text(), "", true);
}
void EditorPropertyMultilineText::_text_changed() {
	emit_changed(get_edited_property(), text->get_text(), "", true);
}
void EditorPropertyMultilineText::_open_big_text() {