The following bug fixes have been made:

Fixed an issue where countering the final boss during a melee attack before it enrages would cause it to flinch and stop acting until the enrage trigger
Fixed an issue where the final boss could sometimes not be killed by a bullet counter
Fixed an issue where the final boss would slide when firing a shockwave
Fixed an issue where the final boss's melee attacks after enraging could not be countered
Fixed an issue where the Stage 3 boss would land on top of a door during its jump attack