Searching doesn't work for deleted users

All the messages, and now even IDs of the deleted users are unsearchable using the Discord search function. This makes it impossible to located specific messages that users that are now deleted have sent in the past, and also impossible to differentiate them from other messages from other deleted users. It's very bad.
Please add the option where searching by ID we can directly find all messages from a user, all mentions and all times the number appears even if the user is now deleted.