I don't know why this issue exists. With what I learned from a former dev, Amy was once intended to be unlockable by completing Mario Koopa blast before changing over to frozen hillside.
When I placed NPC amy on a Mario Mode map, instead of NPC amy as I expected, instead I got a Toad!
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My hypothesis is that originally MT_TOAD didn't have a thing number assigned so this would've been a funny thing to discover 5 months after the update came out
The actual reason: I coded the Rosy Cameo and put it in FHZ myself, and added this case because I was terrified a now ex-developer was going to forcibly move it to Pipe Towers just to make the Dorkly-tier "princess in another castle" joke, basically ruining the experience of anyone trying to get Amy by making them play through a mediocre returning level. Since Fang and Metal were just unlocked by playing the campaign, several of us felt it was necessary to keep barriers low for her - and a gate behind a high-emblem unlockable showing its age was a bridge too far.