### 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)

push_error(vformat(R"(Invalid get index "%s" on base Nil)", name), p_identifier);
					}
					return;
				}
				case Variant::DICTIONARY: {
					GDScriptParser::DataType dummy;
					dummy.kind = GDScriptParser::DataType::VARIANT;
					p_identifier->set_datatype(dummy);
					return;
				}
				default: {
					Callable::CallError temp;
					Variant dummy;
					Variant::construct(base.builtin_type, dummy, nullptr, 0, temp);
					List<PropertyInfo> properties;
					dummy.get_property_list(&properties);
					for (const PropertyInfo &prop : properties) {
						if (prop.name == name) {
							p_identifier->set_datatype(type_from_property(prop));
							return;
						}
					}
					if (base.is_hard_type()) {
						push_error(vformat(R"(Cannot find property "%s" on base "%s".)", name, base.to_string()), p_identifier);
					}
				}
			}
		}
		return;
	}