With a shape set, MediaField replaces the plain thumbnail: it draws the picture
in that shape and lets somebody drag and zoom to say which part shows. It already
did all of that — it needed the block's crop and the aspect.
Without a shape there is nothing to frame into, so the thumbnail stays and there
is no framing control that would do nothing.
Changing the shape clears the crop. A crop is a rectangle OF a shape, and keeping
it would frame the new one by numbers chosen for the old.
One SHAPES table, because three things have to agree: the options, the float
stored as content.ratio, and the Tailwind aspect MediaField frames into.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>