Assignment Explorer: Lost object listed in wrong app

[NKarolak]

My workspace consists of two apps of the same repository, whereas the second app is the test app.

Because I had deleted a bunch of objects in the past, it was time to clean the Ninja Assignment explorer from lost object IDs.
I reclaimed all of them but one, because it is listed in the wrong app:

In the "normal" app, there is already a codeunit 5338214.
The test app object ID range starts with 5338500, and it never had any other object range, so I really have no explanation how the other ID got listed there, and for how long.

Btw, both apps have an .objidconfig defined. Test app:

  "idRanges": [
    {
      "from": 5338500,
      "to": 5338599,
      "description": "Test app"
    }
  ]

What am I supposed to do with this Lost entry? I'm scared of pressing "Reclaim object ID" ...