@mhyland18@PShearer91@bfutch28@PmtStats Therefore, if the runner advances and scores without any batters reaching base (by means of stolen base, sacrifice, fielder's choice, etc.), and this turns out to be the winning run, then the losing team will still be credited with a perfect game, despite losing the game.
@mhyland18@PShearer91@bfutch28@PmtStats In leagues that use a WBSC tiebreaker (including MLB since 2020), runners are placed on second base, and in some leagues, also on first base at the start of each half-inning during extra innings; this automatic runner would not cause a perfect game to be lost.