It doesn't for me. I needed to add -na to the switches.

Oh, right - perl5200delta:

-F now implies -a and -a implies -n

Previously -F without -a was a no-op, and -a without -n or -p was a no-op, with this change, if you supply -F then both -a and -n are implied and if you supply -a then -n is implied. You can still use -p for its extra behaviour. [perl #116190]