Sleep Schedule Setting bug

today I am having problem revising the sleep schedule on my Garmin Connect Mobile app and on my FR570. 

Here is what happened.  The sleep schedule was set to

Bed Time: 9pm,

Wake Time: 9:01pm. 

It was set this way to work around the Battery Savor and Sleep Mode issue I have been experiencing since I can't delete the sleep schedule. With this Bed/Wake time set up, I can manually start "sleep mode" and disable the Battery Savor auto-on problem to ensure sleep tracking.  However I am finding the data of breathing variation and SpO2 has been missing since I modified the sleep schedule to 1 minute apart.

Trying to root cause the missing data issue, I am trying to update the sleep schedule today and then encounter the problem of unable to revise the sleep schedule.  I am able to change Bed Time to 8pm or any and save the changes.  However when i dial the Wake Time, the error message "Schedule Overlaps" keeps popping up no matter what hours I set to.  I can only update the Bed Time, but unable to change the Wake time.

I checked and confirmed the software version is the 6.17 bundle.