[Desktop][Your Library] Song order in playlist (no an idea)

[Ixian]

I had given my own song order in a custom playlist. It's now gone. I have an idea since the last update.

Pressing (by accident) once the 'order by date' e.g. my order is now gone. The numbers in front of a song are not fixed (anymore?) so they change when reordering. How can I get my custom order back and prevent Spotify from losing it? Thanks!