Regression: "Display the file download URI" on related file entity shows relative path

This certainly seems a regression because of issue #2669074: Convert file_create_url() & file_url_transform_relative() to service, deprecate it →

As per the change record file_create_url()<code> is supposed to be moved to <code>\Drupal::service('file_url_generator')->generateAbsoluteString($uri)

Instead of that, it is updated with $this->fileUrlGenerator->generateString($uri)

That sounds the root cause of the regression.
Probably this wasn't caught becuase we don't have test coverage for this one.

I've raised a PR with the fix and working on test coverage.

Can the issue summary be updated to include the issue this was added? May have been done on purpose. 4 years makes me wonder if it was a regression