I think that's always been the case Fred.
As far as I understand that applies to everyone with multiple citizenship when visiting a country they hold a passport for.
I got ya!!
So in reality,my kids are second class British citizens (whilst in R.P), EVEN if they were born in the U.K.
Don`t get me wrong..I`m not that worried as the UK consul support doesn't amount to much for Brit expatriates here anyway!