I have noticed that the Apple Display of my docked MBP was on. After a little digging, I found that the assertion for display was on but there was no process claiming it. How can this be possible?

$ pmset -g assertions | egrep '(PreventUserIdleSystemSleep|PreventUserIdleDisplaySleep)'
   PreventUserIdleDisplaySleep    1
   PreventUserIdleSystemSleep     0

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