Swipe to unlock doesn't always appear when EHS is active

We've discovered an inconsistency with how EHS interacts with swipe-to-unlock.  When EHS is initially started, swipe-to-unlock doesn't appear, but once our app has been started and put into the background with the Home button, it (usually) does appear consistently after that.

 

We're interested in swipe-to-unlock always appearing, or being configurable such that it does.

 

Any suggestions?