Following a custom crop of a photo in the WordPress image editor I can't select from all the image sizes (attachment sizes) when I go to add a photo to a post. When I go > 'Insert Media' > 'Attachment display setting' > 'Size' I cannot see all the available sizes (ie. Full size, Thumbnail, Large). I just get an option of 'Thumbnail' or 'Full size'. There should be 'Large' in the list but it's missing. I know the 'Large' version exists as I can see it on the server.
This only happens for images that I have cropped. For images that have not been edited in the image editor I still get the complete list of sizes in the 'Size' dropdown.
When I am cropping the image I am selecting the box that say 'Only apply to thumbnail' (not that that should make any difference).
What could be causing this?