On February 20, the Third Circuit heard argument in Pennsylvania State Conference of the NAACP v Secretary, 23-3166. See this story. The issue is whether a returned postal ballot is valid or not if the voter forgot to fill out the question on the outer envelope that asks for the date.
All returned ballots are date-stamped when received, so the information about the date the voter put the ballot in a postal collection box is not actually used for any purpose. The 1964 federal Civil Rights Law has a section that is known as the “materiality” voting law. It says if a voter makes a mistake that is not actually “material” for election administration purposes, the vote should count.
This issue has been in Pennsylvania courts for three years now. The U.S. District Court had ruled in favor of the voter-plaintiffs, but then the Third Circuit had stayed the decision.