Hidden objects in the MSSL list

Hi,

We have a critical issue with "hidden" or "invisible" items in some fields in the meta card. The user (classic user or administrator) has all rights to read/edit the object.
If a search is used, M-files find and shows the mentioned object.
Also, the object is visible in views
However, if we want to manually select this object in the MSSL property, the object does not exist in the list > No matches.

There are no filters set on MSSL, and the field is automatically filled using Complianke Kit > Managed Properties.

Issue started appearing aprox 2 months ago and is appearing on various objects/classes.