My Sekai's Miku Birthday Event

It seems only Nigomiku showed up for My Sekai's birthday event... 🥲 I'm happy to see Nigomiku, of course, but I was hoping it would be a good chance to see the original Miku from the tutorial again, so it's a bit disappointing... Also, only Nigomiku reacts to the Miku birthday chair. Wouldn't it have been better if all Miku units reacted to it at least?