Delete and archive message shortcuts

Here is my keymap.json (custom from Outlook defaults)

{
  "application:new-message": "c",
  "core:archive-item": "y",
  "core:remove-and-previous": "backspace",
  "core:remove-and-next": "del",
  "core:star-item": "ins",
  "core:remove-from-view": "y"
}

backspace and del have no effect to delete the message and move the cursor (del worked when used for core:archive-item as default).

Did I misinterpret the commands ?
Can anyone reproduce ?


(Originally posted by mat-m on GitHub.)