Perhaps has been reported before(?):
Checked In Luggage status in the app, while a great idea, isn't reliable.
I'm aware of the disclaimer, and probably the app just gets the wrong info from the airport system. I'm not sure how often info is wrong, but if it is often wrong, one could question why implement the feature at all? =)
Example: sitting waiting at BER for flight to ARN. Status in app is "Loaded on SK2678". However, the machine flying SK2678 today hasn't even landed at BER yet, so it would be a feat to have my luggage loaded already!
That said, Checked In Luggage status seems to have been working accurately at ARN and OSL, based on my experience.
Maybe this is a one off error at BER and then alright, no big problem. However, it would perhaps be worth looking into data from different airport to try to determine whether it's accurate or not. If often incorrect/unrealistic, then those airports could be disabled from this functionality in the app?