### 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)

r_static = false;
	r_vararg = false;
	r_default_arg_count = 0;
	StringName function_name = p_function;
	if (p_base_type.kind == GDScriptParser::DataType::ENUM) {
		if (p_base_type.is_meta_type) {
			
			p_base_type.kind = GDScriptParser::DataType::BUILTIN;
			p_base_type.builtin_type = Variant::DICTIONARY;
			p_base_type.is_meta_type = false;
		} else {
			push_error("Cannot call function on enum value.", p_source);
			return false;
		}
	}
	if (p_base_type.kind == GDScriptParser::DataType::BUILTIN) {
		
		Callable::CallError err;
		Variant dummy;
		Variant::construct(p_base_type.builtin_type, dummy, nullptr, 0, err);