Container Minecarts Can't be accesed when they are in a block

You could open the Gui in 1.8
I've not seen this in any changelog som i assume it's a bug.
the hitbox looks exactly the same in both 1.8 and 1.9
LEFT 1.8 RIGHT 1.9
the hitbox looks the same to me. i can't spot any differance.
also i used summon to get it in the center