Don’t need support since I figured it out, but figured you’d want to know.
Running Akkoma 3.5.0 on FreeBSD 13, trying to change my avatar would fail without any indication why (also my profile name would disappear when this happens), digging through any logs I could find led me to this:
[error] #PID<0.1964.0> running Pleroma.Web.Endpoint (connection #PID<0.1912.0>, stream id 13) terminated Server: fedi.mischivous.com:80 (http) Request: PATCH /api/v1/accounts/update_credentials ** (exit) an exception was raised:
** (ArgumentError) errors were found at the given arguments:
* 1st argument: not an atom
:erlang.apply("Pleroma.Upload.Filter.AnonymizeFilename", :filter, [%Pleroma.Upload{blurhash: nil, content_type: "image/jpeg", height: nil, id: "cd96f95b-b419-4cb8-acc1-aed789b5b00a", name: "wink.jpg", path: "cd96f95b-b419-4cb8-acc1-aed789b5b00a/wink.jpg", tempfile: "/tmp/plug-1674/multipart-1674092016-212371664429416-1", width: nil}])
(pleroma 3.5.0) lib/pleroma/upload/filter.ex:31: Pleroma.Upload.Filter.filter/2
(pleroma 3.5.0) lib/pleroma/upload.ex:84: Pleroma.Upload.store/2
(pleroma 3.5.0) lib/pleroma/web/activity_pub/activity_pub.ex:1505: Pleroma.Web.ActivityPub.ActivityPub.upload/2
(pleroma 3.5.0) lib/pleroma/user.ex:608: Pleroma.User.put_upload/2
(pleroma 3.5.0) lib/pleroma/user.ex:599: Pleroma.User.put_change_if_present/3
(pleroma 3.5.0) lib/pleroma/user.ex:541: Pleroma.User.update_changeset/2
(pleroma 3.5.0) lib/pleroma/web/mastodon_api/controllers/account_controller.ex:237: Pleroma.Web.MastodonAPI.AccountController.update_credentials/2
Removing the anonymize filename upload filter fixed it.