rekordbox 6.3.0 - XML export question

Hi.

As the XML export function is back in rekordbox 6.3.0 I was testing it.
I currently keep rekordbox 5 and 6 in sync. I am doing this via the XML export/import. Exporting in rb5 and importing in rb6 works well.

Now I had the situation that I wanted to transfer data from rb6 to rb5. I exported the XML from rb6 and wanted to import certain data into rb5.

When looking to the 'all tracks' section all looks normal. Import is ok.
However - when going to the 'playlists' section, the data is very weird. It shows just the same track in all playlists. The number of track within a playlist is fine but all lines are filled with the same track.

Not sure how other software interprets the rb6 XML but rb5 seem to have an issue with it.
I tried it with rb 5.6.0 and rb 5.8.5