Property with Union Type “int|null” => Default null value for not-nullable property is invalid

[CreativeNative]

I changed the type declaration from “?int” to Union Type “int|null” and now I get a lot of “Default null value for not-nullable property is invalid” errors, because of “WebimpressCodingStandard.Classes.NoNullValues.Invalid”.

private int|null $id = null;
This produces “Default null value for not-nullable property is invalid” error and when I automatically fix it, it deletes the part “ = null” and breaks my code. The property is nullable and has as default value null. I don't understand why it says it is not-nullable.

private ?int $id = null;
This instead produces no errors and works fine.

PHP version: 8.2