Another situation which I guarantee is not enforced consistently, exactly the same as last week.
Tete doesn't even attempt to mark Garnacho, and I'm not even sure he is aware that he is there so how is it clear and obvious that Maguire is interfering? If Maguire had scored or even touched it sure, but he doesn't.
By the letter of the law it is probably just about the correct decision, but players stand in offside positions on virtually every set piece and are technically occupying defenders, which could be considered interference.