### 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)

}
		Error err = parser_ref->raise_status(GDScriptParserRef::PARSED);
		if (err) {
			push_error(vformat(R"(Could not parse script "%s": %s.)", script_path, error_names[err]), p_source);
			return ERR_PARSE_ERROR;
		}
		ERR_FAIL_COND_V_MSG(!parser_ref->get_parser()->has_class(p_class), ERR_PARSE_ERROR, R"(Parser bug: Mismatched external parser.)");
		GDScriptAnalyzer *other_analyzer = parser_ref->get_analyzer();
		GDScriptParser *other_parser = parser_ref->get_parser();
		int error_count = other_parser->errors.size();
		other_analyzer->resolve_class_inheritance(p_class);
		if (other_parser->errors.size() > error_count) {
			push_error(vformat(R"(Could not resolve inheritance for class "%s".)", p_class->fqcn), p_source);
			return ERR_PARSE_ERROR;
		}
		return OK;
	}
	GDScriptParser::ClassNode *previous_class = parser->current_class;
	parser->current_class = p_class;
	if (p_class->identifier) {
		StringName class_name = p_class->identifier->name;
		if (GDScriptParser::get_builtin_type(class_name) < Variant::VARIANT_MAX) {
			push_error(vformat(R"(Class "%s" hides a built-in type.)", class_name), p_class->identifier);
		} else if (class_exists(class_name)) {
			push_error(vformat(R"(Class "%s" hides a native class.)", class_name), p_class->identifier);
		} else if (ScriptServer::is_global_class(class_name) && (ScriptServer::get_global_class_path(class_name) != parser->script_path || p_class != parser->head)) {
			push_error(vformat(R"(Class "%s" hides a global script class.)", class_name), p_class->identifier);
		} else if (ProjectSettings::get_singleton()->has_autoload(class_name) && ProjectSettings::get_singleton()->get_autoload(class_name).is_singleton) {
			push_error(vformat(R"(Class "%s" hides an autoload singleton.)", class_name), p_class->identifier);
		}