I'm quite sure I found the reason for this behavior - A closer look at my settings showed following:
[Screen:]
Turn off after: 10 minutes
Lock Screen after: Screen turns off
[Power]
Suspend when inactive for: 10 minutes
Therefore, what most probably happens is: Both Suspend and Screen Lock are in this setting initiated at the same instant, however the Suspend mode preempts the Screen Lock and so after the systems is resumed, the Screen Lock is subsequently initiated.
I'm quite sure I found the reason for this behavior - A closer look at my settings showed following:
[Screen:]
Turn off after: 10 minutes
Lock Screen after: Screen turns off
[Power]
Suspend when inactive for: 10 minutes
Therefore, what most probably happens is: Both Suspend and Screen Lock are in this setting initiated at the same instant, however the Suspend mode preempts the Screen Lock and so after the systems is resumed, the Screen Lock is subsequently initiated.