Hi Ves,
Tracks in Intelligent Playlists are changed with various triggers depends on the criteria.
So rekordbox doesn't always preserve the tracks in Intelligent Playlists.
rekordbox only preserves the criteria of each Intelligent Playlist and shows the tracks when the list is selected.
To automatically upload the tracks in the Intelligent Playlists, rekordbox needs to always check the current status of all Intelligent playlists if new track is added.
We forward the feedback to the engineering team, but we don't think it can be achieved because it would reduce general performance of the application.