It is intermittent. Let's not give up just yet. I just reproduced it again after reading your response.
https://www.dropbox.com/s/7yy6kbpjlx1zpty/Reproduced.png?dl=0 Have your tried booting into runlevel 1 or 3 and doing it first thing? Recall it only happens once per log-in, so if you have any scripts going off automatically during log-in, they may be hiding the bug. I am using KDE, your GUI may be "concealing" the bug. I am also using Fedora 29. My current bash version is "4.4.23(1)-release", instead of just "4.4.23", though.
