### 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)

for (GDScriptParser::ClassNode *script_class : script_classes) {
				if (script_class->has_member(name)) {
					resolve_class_member(script_class, name, p_identifier);
					GDScriptParser::ClassNode::Member member = script_class->get_member(name);
					switch (member.type) {
						case GDScriptParser::ClassNode::Member::CONSTANT:
							
							p_identifier->set_datatype(member.get_datatype());
							p_identifier->is_constant = true;
							p_identifier->reduced_value = member.constant->initializer->reduced_value;
							return;
						case GDScriptParser::ClassNode::Member::ENUM_VALUE:
							p_identifier->set_datatype(member.get_datatype());
							p_identifier->is_constant = true;
							p_identifier->reduced_value = member.enum_value.value;
							return;
						case GDScriptParser::ClassNode::Member::ENUM:
							p_identifier->set_datatype(member.get_datatype());
							p_identifier->is_constant = true;
							p_identifier->reduced_value = member.m_enum->dictionary;
							return;
						case GDScriptParser::ClassNode::Member::CLASS:
							p_identifier->set_datatype(member.get_datatype());
							return;
						default:
							break;
					}
				}
			}
		}