"...If you reposition one of the placed (not filled) images within its frame, it seems to become uncropped (as you said). This happens reproducible, when a outline is applied. In this case, if you toggle the background color of the image frame from „None“ to „Transparent“ (and/or back), this redraw issue disappears. On output (Preview, browser preview, export, publish), it isn’t shown at all..." --> Changing the background color does not affect this behavior in my environment, but toggeling the border on/off displays the cropped image correctly again. But the circle imageframes were displayed wrong in Safari. The (un)cropped image is shown in front of it's frame (look at my latest graphic above - this is a view of the exported HTML in browser). This doesn't happen with rounded rectangles. Here might be another bug while exporting the files (or does Apple make their own rules?)...
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