regression / plasma5's Keyboard Shortcuts partly broken -- some key actions work, others don't

[pgndev]

I've seen multiple reports of issues with latest Plasma's Keyboard
Shortcuts not working.

I can verify inconsistent behavior.  Some key actions work, others don't.

To test, I upgraded a system from

  kde4-config --version
    Qt: 4.8.7
    KDE Development Platform: 4.14.9
    kde4-config: 1.0

to Plasma5 git versions

  rpm -qa plasma5-desktop khotkeys5 kwin5
    kwin5-5.3.91git~20150722T084248~a0adf35-134.1.x86_64
    plasma5-desktop-5.3.91git~20150722T112129~a45c51e-114.1.x86_64
    khotkeys5-5.3.91git~20150604T013319~78dd188-4.3.x86_64

Open the KDE settings for Custom Shortcuts

  @ KDE/Plasma5
    SystemSettings5
      Shortcuts
        Custom Shortcuts
          About KDE Hotkeys Configuration Module
            Version 5.3.90
              Using:
                KDE Frameworks 5.13.0
                Qt 5.5.1 (built against 5.5.1)
                The xcb windowing system


Create 2 new Custom Shortcuts

  (1)
    Trigger: Ctrl+Alt+/
    Action:  Shift+1

  (2)
    Trigger: Ctrl+Alt+'
    Action:  Shift+p

Press "Ctrl+Alt+/" in any active window with text input

  Expected Output:  !
  Actual Ouptut:    1

Press "Ctrl+Alt+'" in any active window with text input

  Expected Output:  P
  Actual Ouptut:    P

On the prior KDE4 config, on which @Press "Ctrl+Alt+/" in any active
window with text input

  Expected Output:  !
  Actual Ouptut:    !

worked.

What component needs to be reported against & fixed to get these
Shortcuts working properly?