Embed comments : TypeError: Attempting to register an unknown factory: `site-settings:main`

I’m having this issue on a self-hosted instance. I get the error when I’m in settings and I reload the page. I also get it when I follow a link to a settings area (ie in the welcome setup email).

This means non-admin my users appear to be safe unless they reload the page in their profile settings, but wondering what the issue might be.

“TypeError: Attempting to register an unknown factory: ‘site-settings:main’”