### 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 (err.error != Callable::CallError::CALL_OK) {
			ERR_FAIL_V_MSG(false, "Could not construct base Variant type.");
		}
		List<MethodInfo> methods;
		dummy.get_method_list(&methods);
		for (const MethodInfo &E : methods) {
			if (E.name == p_function) {
				function_signature_from_info(E, r_return_type, r_par_types, r_default_arg_count, r_static, r_vararg);
				r_static = Variant::is_builtin_method_static(p_base_type.builtin_type, function_name);
				return true;
			}
		}
		return false;
	}
	if (p_is_constructor) {
		function_name = "_init";
		r_static = true;
	}
	GDScriptParser::ClassNode *base_class = p_base_type.class_type;
	GDScriptParser::FunctionNode *found_function = nullptr;
	while (found_function == nullptr && base_class != nullptr) {
		if (base_class->has_member(function_name)) {
			if (base_class->get_member(function_name).type != GDScriptParser::ClassNode::Member::FUNCTION) {
				
				push_error(vformat(R"(Member "%s" is not a function.)", function_name), p_source);
				return false;
			}
			resolve_class_member(base_class, function_name, p_source);
			found_function = base_class->get_member(function_name).function;
		}