SUMMARY
Double-clicking to launch AppImages, .exe's or .sh's work normally. However, right-clicking then running isn't possible as there is no 'Execute' option listed in the menu. Same with .desktop files; they work if you double-click, but you cannot right-click and execute.


STEPS TO REPRODUCE
1. Find executable file in Dolphin (already marked as executable in 'File Properties'.)
2. Right-click on executable file to show the 'right-click menu'.
3. Attempt to locate a 'Run/Execute/Launch' option in the menu.

OBSERVED RESULT
An 'execute' option is not listed in the right-click menu of the selected executable file.

EXPECTED RESULT
An 'execute' option should be listed for the user to right-click and execute the file.

Operating System: openSUSE Leap 15.4
KDE Plasma Version: 5.25.2
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5
Kernel Version: 5.14.21-150400.22-default (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-3320M CPU @ 2.60GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000

ADDITIONAL INFORMATION
I was advised to open this bug report, as I posted the issue in the wrong thread here: https://bugs.kde.org/show_bug.cgi?id=429603
Seems like the option did exist at some point as indicated here: https://bugs.kde.org/show_bug.cgi?id=357469
I can't tell when the regression occurred though.