SUMMARY
I have set up Activities: www, sys, kodi, game
I have applications set up, so they open up in their own Activities:
- kodi opens in "kodi" activity
- goverlay opens in "game" activity
- steam opens in "game" activity

When starting applications, either via shortcut (for example Ctrl+Alt+4 for kodi), or in Krunner, applications do start in their own activity, but the activity is not switched to automatically.

Applications that DO work and switch to their own activity, are:
-firefox opens in "www" activity and takes focus
-Dolphin opens in "sys" activity and takes focus
-Konsole opens in "sys" activity and takes focus


STEPS TO REPRODUCE
1. Create an activity and name it "game"
1. Go to Window Management -> Window Rules -> Add New
2. Window class (application) -> Exact match -> steam
3. Add Property -> Size & Position -> double click Activities
4. Assign to "game" activity
5. Go to some other activity than "game"
6. Start Steam with Global Menu or Krunner or a custom shortcut  (doesn't matter which)

OBSERVED RESULT
Steam starts up in "game" activity, but the focus is still in the other activity



EXPECTED RESULT
Steam starts up in "game" activity and switches automatically to "game" activity

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.16.11
KDE Plasma Version: 5.24.2 (Wayland)
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2