Make sure that you have everything Apple Intelligence enabled because it took up to 24 to 48 hours for the image playground app to work for me. Note this is coming from a fellow developer not official update as we cannot do that on the forums. I am only sharing my own experience. It may take some time for the support files like it did for me to become available for image playground again. Sincerely, Donald Kirby
If you are having problems and find that you need to downgrade and then image playground doesn't work please follow these steps
Additionally if you have a back up in Finder the Apple Intelligence and Siri files will have to re-download. I witnessed this for myself but I have my phone back to normal. I am going to wait until the next build to go back to 27. Hope this helps everyone.