### 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)

resolve_function_body(member.variable->getter);
				}
				if (member.variable->setter != nullptr) {
					resolve_function_signature(member.variable->setter);
					if (member.variable->setter->parameters.size() > 0) {
						member.variable->setter->parameters[0]->datatype_specifier = member.variable->datatype_specifier;
						member.variable->setter->parameters[0]->set_datatype(member.get_datatype());
					}
					resolve_function_body(member.variable->setter);
				}
			}
		}
	}
	
	for (int i = 0; i < p_class->members.size(); i++) {
		GDScriptParser::ClassNode::Member member = p_class->members[i];
		if (member.type == GDScriptParser::ClassNode::Member::VARIABLE) {
#ifdef DEBUG_ENABLED
			HashSet<uint32_t> previously_ignored = parser->ignored_warning_codes;
			for (uint32_t ignored_warning : member.function->ignored_warnings) {
				parser->ignored_warning_codes.insert(ignored_warning);
			}
			if (member.variable->usages == 0 && String(member.variable->identifier->name).begins_with("_")) {
				parser->push_warning(member.variable->identifier, GDScriptWarning::UNUSED_PRIVATE_CLASS_VARIABLE, member.variable->identifier->name);
			}
#endif
			if (member.variable->property == GDScriptParser::VariableNode::PROP_SETGET) {
				GDScriptParser::FunctionNode *getter_function = nullptr;
				GDScriptParser::FunctionNode *setter_function = nullptr;
				bool has_valid_getter = false;