Shortcuts next to treeview disappear after closing Rekordbox

Not sure if this is a known bug.

If I add a shortcut (left hidden pan) to a folder in the Explorer tree, after I close Rekordbox, when I reopen, all the shortcuts disappear. The default shortcuts (Collection and iTunes) are still there.

From some testing, I was able to reproduce the issue and I believe it's related to the length of the path to the folder.

If I add a shortcut to this folder it's ok:

 Macintosh HD/Users/Tony/Music/2 - House/2 - Deep House & Progressive

 If I add this folder, the problem occurs:

 Macintosh HD/Users/Tony/Music/2 - House/2 - Deep House & Progressive/7 - Balearic Deephouse

Can you please verify you can reproduce a bug and suggest a solution?