Like in the topic - and after reading logs I think that's because the sleep "lock" is released after executing the post-backup events.
When the "prevent sleeping" option is turned off the computer goes to sleep normally.
Here's the log:
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2021-10-16 15:37:17 A backup item has been added to the database.
2021-10-16 15:37:17 Executing the post backup events...
2021-10-16 15:37:17 Putting the computer to sleep...
2021-10-16 15:37:17 The computer is now asleep.
2021-10-16 15:37:17 The post-backup events have been executed.
2021-10-16 15:37:17 Deleting the Volume Shadow Copy image...
2021-10-16 15:37:18 The Volume Shadow Copy image has been successfully deleted.
2021-10-16 15:37:18 The computer can now enter sleep mode.
2021-10-16 15:37:18 The backup has ended without errors.