I believe I've found the cause of this.
For future reference, the successful troubleshoot was logging at the
beginning and end of any methods which might be invoked automatically
to update views, such as -reloadData, -menuNeedsUpdate, -
validateMenuItem, etc.
In my case, it looks like the deleted object is retained in a
'selectedObjects' instance variable which I had foolishly added in
order to gain observability for some bindings. Then, upon deleting an
object, a menu-update notification accesses 'selectedObjects' before
the notification which updates and removes the deleted object from
'selectedObjects'.
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