Fabric live pool schedule ignoring schedule end time

I've created an environment for use in a custom live pool, with the intention of reducing notebook startup times. I've set that custom live pool schedule for monday through friday, starting at 9 AM and ending at 7 PM (UTC-3, Brasilia timezone), as per the picture below:

However, it seems as if this timezone is being ignored by the Fabric runtime, since there were executions after 7 PM on the first day the schedule was active:

Also, there were no executions starting at 9 AM:

Is this a known issue?

EDIT: Upon further analysis, this doesn't seem to be timezone related. I have recreated the live pool schedule to start at 9:30 AM and end at 12:00 PM, with idle deactivation after 35 minutes and reactivation every 1 hour:

Upon checking the monitoring page, I can see that it actually activated for the first time correctly at 9:30 AM, but kept activating past the time when it was supposed to stop (12:00 PM):

I have updated the post title to reflect this behavior.