tests/src/directory/issuer.rs, new in v0.16.23, tests routing a bearer token to a directory by its issuer. That routing is Enterprise-only upstream (the body of get_directory_for_issuer), and the fork doesn't build it: a token naming no address gets the server default (DIR-2). The test also calls a helper from upstream's Enterprise-only OIDC test, so it can't compile here. mta.rs imported types::id::Id for code inside an Enterprise snippet; the stripped tree leaves it unused, upstream's as well as ours.