
Screenshot of the same settings in English for ease of reference.
So, as long as "add to library" is always ticked before the reorganize button is pressed, then MusicBee should always be moving it to the library afterwards.
You are claiming that, that doesn't always happen? (Which implies the presence of a bug)
For the bug to be investigated/verified by others, you would have to drill down to the specific irregularity in the files that don't move after the operation.
Maybe the problem files have the same extension?
Maybe they share some tag that other non-problematic tracks don't have?
Et cetera, et cetera.
We won't know any of that. Only you will be able to say.
So unless uu can reproduce the anomaly consistently, this will likely remain unsolved unfortunately.
Edit: Below is the screenshot you linked to.
