Autolock not always locking

I have notice on our 2018 that if I just get out of the car and walk away it always auto-locks. But if I get out of the car and then open and close another door to get something, especially if I hit the unlock button on the door to open another door, the auto lock may not work when I walk away.
 
Auto lock will always work if the fob is within 3 feet or so of a door when all doors are closed, then you walk away.

If the door is open and you start walking away as you swing the door shut, it won't work.

If a passenger or another person has a door open and you've walked away before they close it, it won't work.

If the rear hatch is open and you push the button to close the hatch and walk away before it closes, it won't work.

The hatch was the tricky one for me. If my hands are full I wait for it to close, then walk away listening for the beep. If my hands aren't full I start walking and use the remote to make sure it's locked.
 
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