Duplicate Gather objects with the same `id` (and position) might exist

[xopr]

In rare cases, the old object might not be reused and a new one is created instead.

For objects at the same location, one image might be displayed while another previewMessage is shown.

We might want to guard for this (and remove/rename) the duplicate object(s).

WORKAROUND
Open the editor and remove the duplicate (or all) object(s)