[JamesLeonis]

This is not correct.

The copyright office itself doesn't recognize any transfer of works-for-hire [0] unless there's (#3) a written document of the transfer, (#4) signed by the recipient, (#5) signed by the copyright holder, and finally (#6) the work was made expressly as work-for-hire. Every employment, contractor, and freelancer contract is written with all of these questions accounted for.

Even wedding photographers keep the copyright of the photos they take of your wedding too for this very reason, unless explicitly contracted to transfer those rights.

[0]: https://www.copyright.gov/circs/circ30.pdf, page 5