Krovatkin/revert (#66157)
* Revert "BUG FIX: Assign should copy base class fields as well (#66014)"
This reverts commit 985b797d7d8ee246ce98f134ee0a070eb383eff5.
* Revert "Add a mssing private to protected change in #66014"
This reverts commit b27e9dbcfa41b4973495a8dec3ff2d76ba720aca.
