### 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_type->get_datatype().has_no_type()) {
		return p_type->get_datatype();
	}
	GDScriptParser::DataType resolving_datatype;
	resolving_datatype.kind = GDScriptParser::DataType::RESOLVING;
	p_type->set_datatype(resolving_datatype);
	GDScriptParser::DataType result;
	result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	result.builtin_type = Variant::OBJECT;
	if (p_type->type_chain.is_empty()) {
		
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = Variant::NIL;
		p_type->set_datatype(result);
		return result;
	}
	StringName first = p_type->type_chain[0]->name;
	if (first == SNAME("Variant")) {
		if (p_type->type_chain.size() > 1) {
			
			push_error(R"(Variant doesn't contain nested types.)", p_type->type_chain[1]);
			return bad_type;
		}
		result.kind = GDScriptParser::DataType::VARIANT;
	} else if (first == SNAME("Object")) {
		
		result.kind = GDScriptParser::DataType::NATIVE;
		result.native_type = SNAME("Object");
	} else if (GDScriptParser::get_builtin_type(first) < Variant::VARIANT_MAX) {