Wrong drop from the reaper?

I'm farming the Reaper on a first playthrough (not NG+), and I've already got the MC's weapon, Yosuke's weapon, Teddie's weapon, Yukiko's weapon, Chie's weapon, and Kanji's weapon. With Yosuke, Teddie, and Yukiko in my part, I farmed four sets of Gold Robes, then switched my party to Chie, Kanji, and Naoto to farm their weapons. However, the third time I killed him with this party, instead of dropping Naoto's weapon, he dropped a Gold Robe! Naoto has the Magatsu Kiba equipped, and the internet says the reaper weapon is the Black Hole. What am I doing wrong? Why didn't a Black Hole drop?
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What loot does the Reaper drop in generation zero?
you\xb4ll usually get at least one experimental weapon (if youre above level 25), as well as unique clothes and a pretty nice stack of ammo. And most importantly, bragging rights, its no easy feat to drop a reaper solo.Should I fight the Reaper Persona 4?
Although, it is recommended to only face this boss at a higher level. Anything less than level 75 will be a challenge for any player. While it is possible, it is only recommended to face the Reaper towards the end game. Here's how players can defeat it in Persona 4 Golden.Where do you fight the Reaper in Persona 4?
To find the Reaper, you will need to open up about 20 Treasure Chests. To make It even easier, you can open 20 chests in any dungeon, leave, save your game, and go to floor 5 of Yukiko's castle, as only two chests spawn on that floor. If you fail to discover The Reaper, simply re-load the game and try again.Reaper - Drop of the Blade (Viridian Inferno 2022)
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Images: Jill Burrow, Khoa Võ, Maria Orlova, Karolina Grabowska