Scale Dragonfish-24.04.2.5 - SSH key login issue

Scale Dragonfish-24.04.2.5

I have just “security tuned” my two SCALE NAS’es
And has quite a head scratcher … ( Bug ??)

I uploaded my lappy’s ssh key to the Gui user “Authorized keys” field (1)

On one machine it worked, on the other it didn’t.

I have spend a looong time scratching my head why ?

And finally found out that the public key is refused :
If i set “group” rwx (2) on the users home dir

I can’t see why group access to the home-dir should affect if public key is rejected or not ?

Does any of you “gurus” have an explanation or might this be a bug ??