See this report from the Philadelphia Inquirer. Via How Appealing, which links to the Supreme Court of Pennsylvania’s  per curiam order, two concurring statements (here and here), and a dissenting statement.

From the per curiam order:

The Court hereby ASSUMES its King’s Bench authority over the instant Application, see 42 Pa.C.S. § 502, only to DIRECT that all Respondents, including the Boards of Elections in Bucks County, Montgomery County, and Philadelphia County, SHALL COMPLY with the prior rulings of this Court in which we have clarified that mail-in and absentee ballots that fail to comply with the requirements of the Pennsylvania Election Code, see 25 P.S. §§ 3146.6(a), 3150.16(a), SHALL NOT BE COUNTED for purposes of the election held on November 5, 2024. See Ball v. Chapman,
289 A.3d 1, 28 (Pa. 2023) (“The Election Code commands absentee and mail-in electors to date the declaration that appears upon ballot return envelopes, and failure to comply with that command renders a ballot invalid as a matter of Pennsylvania law.”); see also New PA Project Educ. Fund v. Schmidt, 2024 WL 4410884, at *1 (Pa. Oct. 5, 2024) (per curiam) (“This Court will neither impose nor countenance substantial alterations to existing laws and procedures during the pendency of an ongoing election.”); Baxter v. Phila. Bd. of Elections, 2024 WL 4650792, at *1 (Pa. Nov. 1, 2024) (staying a Commonwealth Court order that had required a county election board to canvass undated ballots for purposes of the 2024 general election).

The Application is DENIED in all other respects. In particular, we deny the request to exercise plenary jurisdiction over related matters that have been commenced in various courts of common pleas. This order shall be deemed authoritative and controlling in all such matters and as to all county election board members.

The dissenters did not really disagree on the merits of counting the ballots; it was about the procedure to get this ruling.