Part missing from rear bumper ?

R

rjod57

Guest
IMG 20170423 151720325 HDR  small
There appears to be a cover missing from underneath the rear bumper, or perhaps this is normal.
Could anyone with a facelift S-Line be so kind as to check their bumper and put my mind at rest.
You can see the rear of the parking sensors through the hole!
Photo:-
 
The car has trailer preperation, this gap is part of it.