Normunds, the quick setup guide I got with the last RB532 R5 is misleading regarding the jumpers, although the title definitely states "ROUTERBOARD 500r5":
It still says:
The board has 2 jumpers for configuring input voltage range and one for disabling PoE controller.
(A bit below the middle of the first page of the quick setup guide.)
I suppose that's where the confusion comes from (I was thinking about it for some seconds, too...).