Notepad++ always loses preferences on update

This has been bugging me for quite some time now, so I thought I should report it so that it finally gets fixed. Whenever I update my Notepad++ Portable installation all my preferences get lost (new document encoding, tab settings, auto-completion settings etc.) and I have to spend a while going through every tab of the preferences dialog resetting them to the way I like. It's quite frustrating.

Please could you look into fixing it for the next update? Thank you.