Solved
Set Alarm does not take into account "Vibrate" setting
When I perform the action "Set Alarm" with "Vibrate" set to "Off", the alarm will still vibrate when it goes off. Changing the parameter does not seem to impact the alarm that will be set.
However, the parameters for hours, minutes, and label work perfectly fine.
Tested on OnePlus 10 Pro - OxygenOS 13.