### 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)

} break;
				case Variant::DICTIONARY: {
					prop = memnew(EditorPropertyDictionary);
				} break;
				case Variant::ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::ARRAY);
					prop = editor;
				} break;
				
				case Variant::PACKED_BYTE_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_BYTE_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_INT32_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_INT32_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_FLOAT32_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_FLOAT32_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_INT64_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_INT64_ARRAY);
					prop = editor;
				} break;