What is the ruling on a bat that a player shows is illegal only when defense complains before the next pitch?

In this scenario, once the defense raises an objection regarding the legality of the bat, the proper ruling is to remove the bat from play. It is important to note that there is no penalty imposed on the offense, meaning that the previous actions of the batter at the plate—such as hitting a home run—still stand. The focus here is on adherence to equipment regulations to maintain fairness in the game. By allowing the offense to continue without penalties, the ruling acknowledges that the players on the field may not have been aware of the bat's illegality until it was pointed out by the defense. This ruling emphasizes the importance of player integrity and proper equipment use while also allowing for the continuation of the game without excessive punitive measures against the offensive team for the situation at hand.