### 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 (p_func->body->has_return) {
			gd_function->return_type = _gdtype_from_datatype(p_func->get_datatype(), p_script);
		} else {
			gd_function->return_type = GDScriptDataType();
			gd_function->return_type.has_type = true;
			gd_function->return_type.kind = GDScriptDataType::BUILTIN;
			gd_function->return_type.builtin_type = Variant::NIL;
		}
#ifdef TOOLS_ENABLED
		gd_function->default_arg_values = p_func->default_arg_values;
#endif
	}
	if (!is_implicit_initializer && !is_implicit_ready && !p_for_lambda) {
		p_script->member_functions[func_name] = gd_function;
	}
	memdelete(codegen.generator);
	return gd_function;
}
Error GDScriptCompiler::_parse_setter_getter(GDScript *p_script, const GDScriptParser::ClassNode *p_class, const GDScriptParser::VariableNode *p_variable, bool p_is_setter) {
	Error err = OK;
	GDScriptParser::FunctionNode *function;
	if (p_is_setter) {
		function = p_variable->setter;
	} else {
		function = p_variable->getter;
	}
	_parse_function(err, p_script, p_class, function);
	return err;
}
Error GDScriptCompiler::_populate_class_members(GDScript *p_script, const GDScriptParser::ClassNode *p_class, bool p_keep_state) {