The county Board of Elections will wait until the ballot-return deadline before pre-canvassing mail-in ballots from the batch of 28,879 voters who received misprinted ballots and then got corrected replacements, so the misprints can be matched up with the replacements and each person's vote only counted once.
https://www.law360.com/articles/1322802/pa-county-gop-candidates-settle-over-29k-ballot-misprints