Found a little bug although I haven't pinned it down completely yet.

It seems if you use CSSU with force rotate on.
Lock the device with Pierogi open and device held portrait.

The lockscreen has a glitch and will not display properly.
I have the default lockscreen, although if QTLockscreen is used the bug doesn't occur.

Also moving the device from portrait to landscape makes the default lockscreen rotate. Which I have never seen before.