### 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)

if (!signal->doc_description.is_empty()) {
					p_script->doc_signals[name] = signal->doc_description;
				}
#endif
			} break;
			case GDScriptParser::ClassNode::Member::ENUM: {
				const GDScriptParser::EnumNode *enum_n = member.m_enum;
				StringName name = enum_n->identifier->name;
				p_script->constants.insert(name, enum_n->dictionary);
#ifdef TOOLS_ENABLED
				p_script->member_lines[name] = enum_n->start_line;
				p_script->doc_enums[name] = DocData::EnumDoc();
				p_script->doc_enums[name].name = name;
				p_script->doc_enums[name].description = enum_n->doc_description;
				for (int j = 0; j < enum_n->values.size(); j++) {
					DocData::ConstantDoc const_doc;
					const_doc.name = enum_n->values[j].identifier->name;
					const_doc.value = Variant(enum_n->values[j].value).operator String();
					const_doc.description = enum_n->values[j].doc_description;
					p_script->doc_enums[name].values.push_back(const_doc);
				}
#endif
			} break;
			case GDScriptParser::ClassNode::Member::GROUP: {
				const GDScriptParser::AnnotationNode *annotation = member.annotation;
				StringName name = annotation->export_info.name;
				
				GDScript::MemberInfo minfo;
				minfo.index = p_script->member_indices.size();
				PropertyInfo prop_info;