Not sure if intended but the image viewer will close if you pan/drag the image up or down a bit and you don't need to be zoomed in at all. This happens on 1.0.101. From the animation, it looks like the tap to close function leverages this to close the viewer since the image slides up or down to the edge of the screen.
I've been seeing it in 95 and 96, with swipe navigation disabled in the settings. If anything it seems to be worse in 96; I can't currently pan a zoomed image by more than a couple centimeters without it closing, where in 95 it mostly (but not always) seemed to happen near the edges.