Minecarts not being powered when on activated powered rails

So I have this issue where if I place a minecraft on powered rails and then porceed to activate the rails, the minecart won't move, unless I push it. I have also tried to power the rials first and THEN place the minecart on them, but it still doesn't do anything. Now, I don't know whether this is a parity thingy or if this is an actual bug, but as far as I know Java doesn't have this issue so I am this really is a bug, because it totally makes the powered useless at the moment