One of the more prominent ones is a new stage called Debug Void, which isn’t available in Random Stage Selection, and only becomes available once you hit level cap.
Gargos Fixed an issue causing his Standing Heavy Kick to deal less damage on counter hit than on a normal hit.
Shadow Lord Bloody Lungs (Challenging): Increased Shadow Meter Drain on hit and during a Shadow Move, and Instinct Meter Drain during a Shadow Move.
The developer says players in the map will “sometimes see things in it that you ordinarily are not supposed to.”