ActivityPub: "Loading interrupted" and profile not found after self-hosted setup

Hello,
I’m self-hosting Ghost 6.26.0. My JWKS endpoint is accessible (HTTP 200), but the Network tab shows “Loading interrupted” and my profile @epicuro@epicuro.net cannot be found on Mastodon.
Could you please check if my site’s registration on your hosted ActivityPub server (ap.ghost.org) is stuck or needs a manual reset?
My site URL is https://epicuro.net.
Thank you for your help.