When I roll back to add a chamfer to a part from which other parts were copied, it seems to work alright but when I clear the rollback point, some of the objects have moved. This video demonstrates what I’m talking about.
Never mind. I discovered that the chamfer messed up the alignment target for the first of the objects that moved. Since the others similar objects were clones and offset from the first, they got moved too. I’m leaving this here to help others who might see a similar issue.