SUMMARY: When creating a custom hotkey shortcut in Settings to send a text string, if a letter is used in the trigger keys, and the string contains that letter, the first instance of the letter is dropped when the string is sent.


STEPS TO REPRODUCE
1. Custom shortcuts -> Edit -> New -> Global Shortcut - Send Keyboard Input
2. Create a key trigger containing a letter. Example - Alt-Shift-F
3. In Action panel, build a string to send with the keystroke. Example:
Shift+f:o:o:Shift+b:a:r:Enter to send "foobar" and a return
4. Execute the trigger in any window (example, Kate)
5. The trigger sends: ooBar
6. Only the first instance of the letter is dropped. Change the build to
Shift+f:o:o:Shift+f:a:r:Enter
7. The trigger sends: ooFar
8. The use of the Shift is not consequential. This occurs on upper and lower case letters.

OBSERVED RESULT
Alt-Shift-F (Shift+f:o:o:Shift+b:a:r:Enter) sends
ooBar

EXPECTED RESULT
FooBar

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-31-generic
OS Type: 64-bit
Graphics Platform: X11

ADDITIONAL INFORMATION

Just want to mention that this process has worked as expected to many past versions. This appears to have been introduced only very recently. The previous version of KDE I used was in Netrunner Twenty (20.01). This issue appeared in their next version (xoxo - 21.01) and is in the current version of Kubunto, which I'm currently using.

Keyboard layout is Generic 104-key for PC. This issue occurs on different keyboards.