The last two times (last year and year before) I exited by paying discounted fee (okay, my bad, but dear immigration officials were so keen to pocket the money, so who am I to argue....!).
In fact the last time after discounted payment, the officer wanted to get rid of me so quick, he took me to a kiosk which was already serving another person, throw my passport at the other guy, he just stamped it without scanning it or putting it through the computer or looking at it. I was pretty worried I will have problem on the way back...
But no problem at all, never have, just Bien Venido and Buen Dia - nice people these immigration guys at POP. Never this blocking etc. as far as I could tell, as I mentioned they never even put mine through the scanner on occasions and specially the last time (which was last year), will see this year.