An additional problem with this is that it makes it very hard to use 'mask to below', as you can only use images that are small enough not to go off the page, or you have to use the vector crop tool to shrink the image you want to use as a mask down, then (if you don't want a bunch of extra pointless masks on your image) undo all of that once its in the right position and apply it as a mask. Then once its in place, if you want to move it again you have to re-crop it or else it jumps to the next page and unmasks.
Honestly there should at least be a button/checkbox/something to make sure that an image doesn't leave a page or to decide how it chooses the page. The middle of an image is simply a bad location to decide if an image shoudl be on a page. there are just too many situations where you need the edge of a picture, or a third of a large picture