@fedify/fedify was patched to remove `w3id.org/identity/v1` context from being sent as it is now a broken redirect, which will cause Piefed to 500 as it fails to load the context
See also: https://socialhub.activitypub.rocks/t/what-are-projects-doing-about-ld-signatures-since-https-w3id-org-security-v1-went-away/3005/5