If I make a shortcut (i.e. a tag) in an annotation layer, that annotation goes in the spot assigned to shift-a. If I delete the shortcut with the [x] button beside it and then add a new shortcut, the new shortcut goes in the shift-w spot just as if the shortcut hadn't been deleted. The same thing happens with multiple tags or multiple deletions, always following on the next spot as if the deletion had not happened.

The tags are deleted correctly in the json. For example, after making and deleting several tags in a few rounds, in my annotation layer I see only:

      "annotationTags": [
        {
          "id": 7,
          "label": ""
        }

After a browser refresh, the next tag behavior works as expected.