IMHO, we can just fix the error here. Autowiring and testing it is a larger p...

IMHO, we can just fix the error here. Autowiring and testing it is a larger problem we can worry about later. I am not sure that TypedData even supports injection this way. Of course, I wrote this ages ago when autowiring was not implemented in Drupal core, so things must have changed.

The fix is already there in your MR. You just need to remove the injection bits and we can create another issue to inject the service properly.