Zoom button no longer works (the way it used to)

Zoom button no longer works (the way it used to)

One of the updates in the past month or two seems to have changed how the small on-screen zoom button worked.

Prior to this update, pressing this button would zoom the host display to a matching 1:1 resolution on the phone. To me, this seems to be exactly how it should work - since at that resolution, the host display is the clearest, pixel by pixel, and it can be difficult to hit that exact resolution when zooming with either the pinch gesture or the dedicated magnifying glass buttons on the phone. Since the update, pressing the zoom button merely zooms in the host display an almost insignificant amount. Pressing it again just zooms back out, again, that small amount.

I'm just wondering if this was the intended function of this button and, if so, what might be the logic behind it's current function. Personally, I find the button effectively useless now and very much miss the older functionality of quickly being able to zoom to a 1:1 ratio between host and client displays.