They telegraphed their intentions to do exactly that.  Dementia-elect Biden blurted it out publicly.

Twice in the last two days, the Secretary of State has fundamentally altered the manner in which Pennsylvania’s election is being conducted. The constantly changing guidance she has delivered to counties not only directly contradicts the Election Code language she is sworn to uphold, but also conflicts her own litigation statements and decisions of both the Pennsylvania Supreme Court and the United States Supreme Court.

Secretary Boockvar told the U.S. Supreme Court on October 28 that ballots received after 8 p.m. on November 3 would be segregated, but she changed the rules on November 1 and directed counties to canvass those ballots as soon as possible upon receipt. In some counties, it is not possible to both segregate and canvass ballots as directed. This directive leaves open the possibility that timely votes will be commingled with votes received after 8 p.m. on Election Day, despite the fact that these votes remain the subject of litigation before the United States Supreme Court.

The Department changed the rules again on November 2 when they provided last-second guidance directing counties to provide information to help voters whose mail-in or absentee ballots were incorrectly completed so those voters could vote on a provisional ballot. The late release of this “guidance” resulted in inconsistent application across the counties – some of whom contacted voters as directed and some who did not. There is no basis for this guidance in current law. The Secretary created this new process out of thin air.

… at 8:38 p.m. on Monday, November 2 – less than 12 hours before the polls were to open – the Department issued an email to counties directing them to provide information to political party and candidate representatives regarding mail-in and absentee ballots which had been set aside because they failed to comply with the requirements of the Election Code in order to be counted, so that voters could come in and vote provisionally at the polls. The late release of this “guidance” resulted in inconsistent application across the counties, some of whom contacted voters as directed and some who did not; such differential treatment is wholly inappropriate and a direct result of Boockvar’s scattershot approach to Pennsylvania’s elections.

The Penn attorney general, Shapiro, is facilitating the election fraud there.