Running playSound3D with different values passed as pitchSound has no noticable effect on the actual pitch of the resulting sound.
There have been no actual changes made to the scripts using this feature, and they suddenly no longer affect the pitch.
The same effect can be observed running the command in the console.
The same effect applies whether a vanilla asset is used or a custom mission sound file.
No errors in RPT. No other defects observed in any scripts.