(Windows 11) Task Scheduler triggers automatically delete themselves after some time

[Windows Server]

I'm trying to configure Windows 11's Windows Defender to only run itself at midnight each day, and at no other time. I've tried going into Task Scheduler and setting a trigger for each of the four sub-tasks to do so, and for the short time the triggers survive they do function correctly, but after around a week the triggers automatically delete themselves and the processes revert to their original seemingly-random timings, which is a problem because Windows Defender Verification seems to be causing lag spikes in programs when it runs and I want to be able to control its run times. (A

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