Nightclub Void

Postgame spoilers I am out out of bounds in the black void outside the Reborn Nightclub. Did a quick search and couldn't find anyone else talking about this. No debug mode, no mods, no nothing not in the vanilla game except those in-game PC passwords like "pinata." Made this account to inform and to see if this bug is replicable. Can others also go out of bounds in the nightclub without any devtools or hacking? This is what I've done: I went to the Nightclub and spoke to the Battle Factory NPC. I choose Doubles and Full Set Field. I won one game then decided to rest. The game saved and returned to the main menu screen. I entered the game again and choose to retire. I then ran to the left to buy something but ended up running off the screen into a black void. I explored the invisible walls for a bit, phased through NPCs, and talked to NPCs from the Void. More details(probably useless): If others can replicate this then maybe the one guy doing a Speedrun of this game could shave off some time. Otherwise its a fun gimmick. Images: