### 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)

GDScriptParser::DataType type;
	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	type.kind = GDScriptParser::DataType::NATIVE;
	type.builtin_type = Variant::OBJECT;
	type.is_constant = true;
	type.native_type = p_class_name;
	type.is_meta_type = true;
	return type;
}
static GDScriptParser::DataType make_native_enum_type(const StringName &p_native_class, const StringName &p_enum_name) {
	GDScriptParser::DataType type;
	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	type.kind = GDScriptParser::DataType::ENUM;
	type.builtin_type = Variant::INT;
	type.is_constant = true;
	type.is_meta_type = true;
	List<StringName> enum_values;
	ClassDB::get_enum_constants(p_native_class, p_enum_name, &enum_values);
	for (const StringName &E : enum_values) {
		type.enum_values[E] = ClassDB::get_integer_constant(p_native_class, E);
	}
	return type;
}
static GDScriptParser::DataType make_builtin_meta_type(Variant::Type p_type) {