I just got a hand planer that looks like this



When set the tool to zero, a straightedge shows that the front sole plate and the rear sole are far from bring on the same plane.


I see on Amazon that even the Bosch that costs 3 times as much has this problem.
On the model I have the front sole plate does not lock in place as it is adjusted up or down, it has a little play in it at each setting for depth of cut.

Most planers have this single knob depth adjustment. Do they all have this play in the front sole plate?