### 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)

bool all_have_type = true;
	Vector<Variant::Type> arg_types;
	for (int i = 0; i < p_arguments.size(); i++) {
		if (!HAS_BUILTIN_TYPE(p_arguments[i])) {
			all_have_type = false;
			break;
		}
		arg_types.push_back(p_arguments[i].type.builtin_type);
	}
	if (all_have_type) {
		int valid_constructor = -1;
		for (int i = 0; i < Variant::get_constructor_count(p_type); i++) {
			if (Variant::get_constructor_argument_count(p_type, i) != p_arguments.size()) {
				continue;
			}
			int types_correct = true;
			for (int j = 0; j < arg_types.size(); j++) {