I think my case is covered by Who will be the copyright owner of a new file in a forked repository on github?, but I want to be sure that it applies in my situation, too.
I forked a project licensed under a 2-clause BSD-style license. The LICENSE file contains a header, followed by the actual license:
Unless explicitly stated otherwise, the following license applies to all files in this repository:
Copyright (year) (authors)
(The files in the repository have no copyright or license information themselves.)
I edited some of the files in this repository, but forgot to update the copyright until later. In this situation, can my committing new code to the repository without updating the copyright notice be interpreted as transferring copyright to the original authors? Or should this be interpreted as a situation in which the original authors and I share copyright?
Also, what does this mean for the license? Is my added code covered by the same license, or is it unlicensed because I did not update the copyright?