When updating the mask to have a new image size, this size isn't available in previous documents that had the image selected. Is there a way to update current images with the new size without having to reselect the same image in the Media Library? I can see that they have the new sizes in the crop editor, but selecting this doesn't work.
I appreciate that this should be defined early on in development, this is to account for a late change in visual output.
It's true that if you update the image size in the custom-types, you will need to reselect those images from the media library to apply the changes. There is no way to update them automatically.
You can only edit images in the picture editing when you have not given sizes in the mask.