Default Unlock animation after camera use

Hi all...

I have recently noticed that if i open the camera from the lock screen when i unlock the device, after that, the unlock animation is ultrafast, and not smooth as usual.
I have to reboot to get it back to normal.
Can anyone duplicate this behavior to see if it is "normal" ?

Tx...

Sent from my Nexus 5 using xda app-developers app
Coming from iphone 5 to
Nexus 5 - PA 4.5 with franco.Kernel...
MIUI V5 as secondary ROM on MULTIROM...
Pretty happy with it...