It looks like KDE connect 1.6.5 is available in Google Play Store but there is no such tag in the anongit repo https://cgit.kde.org/kdeconnect-android.git/ Thus F-Droid can't build the new version.
Sorry, it looks like tag v1.6.5 was never pushed to the repo. Thanks for noticing, I just fixed it.
No problem. Thanks. I'm looking forward for the new version :)
I think the same apllys for v1.6.6 ;)
Sorry, again... I'm really sorry :( I hope I will remember from now on.