Following the docs to verify the Windows msi installer and the sha256 files are all incorrect. This now happens on all released versions (4.4.22, 5.0.18, 6.0.6); previous versions worked correctly (except for the RCs of these releases). Downloaded files all match the etag (md5sum) provided in http headers.
All the msi urls are extracted from https://downloads.mongodb.org/current.json
Thank you and hopefully this is filled in the right project.