Action Lock Until not Working

I am using the following statement in the last component of my Windows 10 1803 upgrade baseline in order to prevent other Bigfix jobs from affecting the upgrade, and then causing it to roll back.

action lock until “{now + 120 * minute}” “{now}”

The client log says that the setting was applied with the correct time settings, but the lock was not set when I queried it in fixlet debugger and also by looking at the lock property in the console after the upgrade was complete. There should have been about an hour 1/2 remaining on the lock.

Any idea why it would have been set and then removed. Would the Windows 10 upgrade from 1709 to 1803 be the cause?