SUMMARY
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The "Virtual Desktop Behaviour" dropdown option in System Settings->Window Behaviour->"Advanced" tab lists 3 options;

-to switch to a virtual desktop when a window is activated in it (i.e. if a rule is applied to the window to remember or force it's chosen virtual desktop)
-to bring the activated/opened window to the current virtual desktop.
-to do nothing - i.e. to let the window open in its own virtual desktop but not move from the current one - suffice to say the newly activated/opened window won't be visible but this is what we want.

The last 2 options do not work - whatever option is chosen, KWin always moves to the virtual desktop that the window is opened in.

STEPS TO REPRODUCE
1. Make a window rule to force a window to a specific virtual desktop.
2. Change this virtual desktop option to "Do Nothing"
3. Launch the application (I tested with Dolphin file manager which is on my taskbar, and both clicking the icon to launch AND using the Super+Number key to launch it both gave the same effect)
4. Notice that it switches to the Virtual Desktop that the application has launched in.
5. Change the option to "Bring to current desktop" and notice that this also switches to the virtual desktop instead of moving the window. 

OBSERVED RESULT
KWin keeps switching to the virtual desktop of the activated window.

EXPECTED RESULT
The set choice of what to do with the activated window is honoured by KWin. 

SOFTWARE/OS VERSIONS
Linux ver 6.8.1-arch1-1
KDE Plasma ver 6.0.2
KDE Frameworks ver 6.0.0
QT version 6.6.2
Graphics Platform X11

ADDITIONAL INFORMATION