SUMMARY
I use konsole for so many years now. Profiles gave me the option to open a new tab and to execute a command. This is how a Root console could be open. 
After my upgrade from Fedora 29 to Fedora 30, konsole was updated to 19.04.2 version. And in this version, commands are not executed. 
That means, I am stuck with bash (I cannot open any other shell), I cannot run a root shell automatically, I cannot ssh to a remote host etc. 

STEPS TO REPRODUCE
1. Open konsole
2. Create a profile that uses a simple command (eg su -) and a different to your current profile colour scheme (so as to understand that the profile is changed)
3. Save the profile
4. From the menu (or the shortcut), select this new profile. 

OBSERVED RESULT
Instead of opening a new tab, in your active tab the color scheme of the new profile will be applied. However, the command is *not* executed. 

EXPECTED RESULT
A new Tab should be opened and the command should be executed on it. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 30/5.15
(available in About System)
KDE Plasma Version: 5.15
KDE Frameworks Version: 5.64
Qt Version: 5.12

ADDITIONAL INFORMATION
I have access to a Leap 15.1 with Frameworks 5.55/Plasma 5.12/QT 5.9 and konsole 18.12.3. On this combination, profiles switching works as always.