### 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)

if (p_hint == PROPERTY_HINT_ENUM || p_hint == PROPERTY_HINT_ENUM_SUGGESTION) {
				EditorPropertyTextEnum *editor = memnew(EditorPropertyTextEnum);
				Vector<String> options = p_hint_text.split(",", false);
				editor->setup(options, false, (p_hint == PROPERTY_HINT_ENUM_SUGGESTION));
				return editor;
			} else if (p_hint == PROPERTY_HINT_MULTILINE_TEXT) {
				EditorPropertyMultilineText *editor = memnew(EditorPropertyMultilineText);
				return editor;
			} else if (p_hint == PROPERTY_HINT_EXPRESSION) {
				EditorPropertyMultilineText *editor = memnew(EditorPropertyMultilineText(true));
				return editor;
			} else if (p_hint == PROPERTY_HINT_TYPE_STRING) {
				EditorPropertyClassName *editor = memnew(EditorPropertyClassName);
				editor->setup("Object", p_hint_text);
				return editor;
			} else if (p_hint == PROPERTY_HINT_LOCALE_ID) {
				EditorPropertyLocale *editor = memnew(EditorPropertyLocale);
				editor->setup(p_hint_text);
				return editor;
			} else if (p_hint == PROPERTY_HINT_DIR || p_hint == PROPERTY_HINT_FILE || p_hint == PROPERTY_HINT_SAVE_FILE || p_hint == PROPERTY_HINT_GLOBAL_SAVE_FILE || p_hint == PROPERTY_HINT_GLOBAL_DIR || p_hint == PROPERTY_HINT_GLOBAL_FILE) {
				Vector<String> extensions = p_hint_text.split(",");
				bool global = p_hint == PROPERTY_HINT_GLOBAL_DIR || p_hint == PROPERTY_HINT_GLOBAL_FILE || p_hint == PROPERTY_HINT_GLOBAL_SAVE_FILE;
				bool folder = p_hint == PROPERTY_HINT_DIR || p_hint == PROPERTY_HINT_GLOBAL_DIR;
				bool save = p_hint == PROPERTY_HINT_SAVE_FILE || p_hint == PROPERTY_HINT_GLOBAL_SAVE_FILE;
				EditorPropertyPath *editor = memnew(EditorPropertyPath);
				editor->setup(extensions, folder, global);
				if (save) {
					editor->set_save_mode();
				}
				return editor;