### 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)

break;
		case GDScriptParser::DataType::CLASS:
			if (p_source.is_meta_type) {
				src_native = GDScript::get_class_static();
			} else {
				src_class = p_source.class_type;
				const GDScriptParser::ClassNode *base = src_class;
				while (base->base_type.kind == GDScriptParser::DataType::CLASS) {
					base = base->base_type.class_type;
				}
				src_native = base->base_type.native_type;
				src_script = base->base_type.script_type;
			}
			break;
		case GDScriptParser::DataType::VARIANT:
		case GDScriptParser::DataType::BUILTIN:
		case GDScriptParser::DataType::ENUM:
		case GDScriptParser::DataType::RESOLVING:
		case GDScriptParser::DataType::UNRESOLVED:
			break; 
	}
	switch (p_target.kind) {
		case GDScriptParser::DataType::NATIVE: {
			if (p_target.is_meta_type) {
				return ClassDB::is_parent_class(src_native, GDScriptNativeClass::get_class_static());
			}
			return ClassDB::is_parent_class(src_native, p_target.native_type);
		}
		case GDScriptParser::DataType::SCRIPT:
			if (p_target.is_meta_type) {