Blank Notification Banner Stuck in macOS Sierra

This blank notification banner appeared out of nowhere, at the top-right corner, and won't go away even if I restart/shutdown the MacBook, kill Dock, Finder or Notification Center. It won't appear if I boot in Safe Mode though. If I have two desktops open by using Spaces, only the first one will have this on, but if I close it, the banner will move to the second one.

Has anyone experienced something like that? I'm on a 13" MacBook Pro running macOS Sierra version 10.12.5.

Solution 1:

I just had the same Problem and disabled all Notifications with no result.
Then I tried stopping some apps and found that the "EthernetStatus Mini"-App was responsible for it.

EthernetStatus Mini running (Banner always appears when Starting EthernetStatus Mini)

EthernetStatus Mini stopped

Solution 2:

I had stuck notification w/ request to change password. And I killed it:

➜  ~ ps -ef|grep -i notif
    0   121     1   0 27Sep19 ??        38:04.27 /usr/sbin/notifyd
133241192  1067     1   0 27Sep19 ??         2:06.70 /System/Library/CoreServices/NotificationCenter.app/Contents/MacOS/NotificationCenter
➜  ~ kill 1067