Rekordbox NOT reading iTunes Sub Folders

I Have researched here and found topics about this issue since 2014, but apparently haven't been solved yet? I will try again, since I haven`t found the properly solution.

I Have sorted my playlists in iTunes by folders: for example Folder "Electronic Music" and than the sub playlists "House" "Alternative" "Tropical" etc. I have also playlists that are not arranged in folders, for example "JOE`s party".

In Rekordbox, after refreshing the icon of iTunes, I can see under the section Playlists all the folders and the playlists that are not in folders. But I can`t see the sub playlists inside the Folders. It looks like the folder is empty. 

So if I go to all music in iTunes tree of Rekorbox I can see everything there, load and play all files. I can also see musics inside the playlists like JOE`S PARTY. But I can`t see the playlists that are sorted inside the folders.

General Informations:

- The option "share iTunes with other apps" is checked ok in iTunes Preferences.

- The iTunes xml file is pointed correctly in Rekordbox Preferences. 

- I have already clicked several times on "refresh" button of iTunes tree

- Rekordbox version 5.3.0

-  version 12.7.4.80

Thanks!