JPEG Artifact Removal has its place, but not something I will use unless absolutely needed. If the image is super compressed the filter will not be able to clean everything up and if the image isn’t very compressed then it can actually create more artifacting. Testing it through an image that has been saved over 100s of times did clear up the subtle pixelation but confused the larger pixelation with being a part of the photo itself and testing against a photo that has been saved from the RAW file at the highest compression caused more artifacting than the JPEG itself.
Also one other thing that is noticeable is it seems there is a bit of an adjustment to the levels as well across all images. Check out our other articles on the 22.0 update: Neural Filters, Sky Replacement, and Pattern Preview.