Unable to receive activity from GoToSocial (social.hyp3r.link)

Test is working fine: https://github.com/importantimport/hatsu/commit/c848a968b03283d7bb348a852c439472b599bd43

I think it might have something to do with [Split-domain deployments](https://docs.gotosocial.org/en/latest/advanced/host-account-domain/).