### Godot version

4.0 Beta10

### System information

Windows 10, Vulkan, GTX1060

### Issue description

`PropertyTweener`'s methods' return value are not discarded and effect the unary operator at next line.

In Editor:
![in_editor](https://user-images.githubusercontent.com/61624558/210715100-04bdf283-7954-4be3-94ca-338987b24c5b.png)


In cpp:
![in_cpp](https://user-images.githubusercontent.com/61624558/210715127-519f6d54-fc15-468f-9aca-ba7d387a5a7b.png)


### Steps to reproduce

Just run the Minimal reproduction project.

### Minimal reproduction project

[Bug Report.zip](https://github.com/godotengine/godot/files/10349829/Bug.Report.zip)

if (keyed_getters_map.has(p_keyed_getter)) {
			return keyed_getters_map[p_keyed_getter];
		}
		int pos = keyed_getters_map.size();
		keyed_getters_map[p_keyed_getter] = pos;
		return pos;
	}
	int get_indexed_setter_pos(const Variant::ValidatedIndexedSetter p_indexed_setter) {
		if (indexed_setters_map.has(p_indexed_setter)) {
			return indexed_setters_map[p_indexed_setter];
		}
		int pos = indexed_setters_map.size();
		indexed_setters_map[p_indexed_setter] = pos;
		return pos;
	}
	int get_indexed_getter_pos(const Variant::ValidatedIndexedGetter p_indexed_getter) {
		if (indexed_getters_map.has(p_indexed_getter)) {
			return indexed_getters_map[p_indexed_getter];
		}
		int pos = indexed_getters_map.size();
		indexed_getters_map[p_indexed_getter] = pos;
		return pos;
	}
	int get_builtin_method_pos(const Variant::ValidatedBuiltInMethod p_method) {