I have found a very weird behavior on stock rom:
When the device daydreams the notification bar appears at the time the limit in Security - Automatically lock is reached with a small dot. This happens even after factory reset and first time stup without any app installs or modifications.
It seems to be a 4.4 (and maybe Sony only) issue as the devices with earlier versions of Android e.g. 4.2 did not have that issue even after upgrading to 4.4 as long as no factory reset is applied.
Does anyone have ideas?
See a short video here