The automount features does not work after the 5.12 update. I enabled my (Internal) HDD to mount on login and on connect and it does not do it.
https://x.scrumplex.rocks/watch/2018-02-09%2022-25-40.mp4 Here is a video demonstrating the issue.
I confirm this bug, i'm using KDE Neon LTS edition and it happen after upgrade to 5.12.
*** This bug has been marked as a duplicate of bug 389479 ***