### 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::ClassNode *previous_class = parser->current_class;
	parser->current_class = p_class;
	resolve_class_interface(p_class, p_source);
	GDScriptParser::DataType base_type = p_class->base_type;
	if (base_type.kind == GDScriptParser::DataType::CLASS) {
		GDScriptParser::ClassNode *base_class = base_type.class_type;
		resolve_class_body(base_class, p_class);
	}
	
	for (int i = 0; i < p_class->members.size(); i++) {
		GDScriptParser::ClassNode::Member member = p_class->members[i];
		if (member.type == GDScriptParser::ClassNode::Member::FUNCTION) {
			
			for (GDScriptParser::AnnotationNode *&E : member.function->annotations) {
				E->apply(parser, member.function);
			}
#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);
			}
#endif 
			resolve_function_body(member.function);
#ifdef DEBUG_ENABLED
			parser->ignored_warning_codes = previously_ignored;
#endif 
		} else if (member.type == GDScriptParser::ClassNode::Member::VARIABLE && member.variable->property != GDScriptParser::VariableNode::PROP_NONE) {
			if (member.variable->property == GDScriptParser::VariableNode::PROP_INLINE) {
				if (member.variable->getter != nullptr) {
					member.variable->getter->set_datatype(member.variable->datatype);