Umbraco-CMS: GetCropUrl returns null with valid cropAlias param V8

Bug summary

ImageCropperTemplateExtensions.GetCropUrl returns null when provided a valid cropAlias parameter unless you save each image in your media library after adding a new crop.

Specifics

This occurs in 8.0.2 and v8/dev using Chrome (but should affect all browsers)

Steps to reproduce

• V8 with SK installed
• Update Image Media Type -> Update umbracoFile Image Cropper DataType settings to include a crop type (ie square)
• Update Products.cshtml / template with <img src='@product.Photos.GetCropUrl("square")' />
• View page on frontend & confirm image renders (they don’t)
• Goto Media Section & Choose a Product Image
• Set manual crops for the image
• View page on frontend & confirm image renders (they do)

Expected result

The images should be rendered. See reproduction for more details.

Actual result

The images are not. See reproduction for more details.