It still needs the same amount of total end play. When you push in on one axle, it is supposed to then push outward on the other axle so the load can be taken up by the bearing on the opposite side.

With your longer axles, won’t the inner ends touch if one axle is pushed in? If not, what is stopping it?

Edit: to clarify, that number is the total endplay. The spacer floats. It will measure the same on either side.