After the 1.13 patch in July 2021, manage mode in franchise...
After pinch hitting for pitchers, unable to put in a warm or otherwise ready reliever from the bullpen. Game rule apparently incorrectly requires the pinch hitter to pitch to 3 hitters, first. If attempt to go to bullpen, game will get stuck on infinite loop to sit pitcher down or warm pitcher up. Cancel option does not work. Need to close out of game to PSN screen.
Are you still experiencing this problem in managers mode? It sucks they didn't fix this bug that they caused in this new update.