Cracked key in mirrored world

[Fleksiu]

Hello, I left the trinket in treasure room in mirrored world, will the cracked key spawn after starting the dad's note sequence?

[Nihleen]

""To create a Cracked Key (once unlocked), drop any trinket in a Boss Room or a Treasure Room on any floor before acquiring 15►Dad's Note Dad's Note, including the room you get Dad's Note in. After starting the Ascent by collecting Dad's Note, the trinket left behind will have become a Cracked Key in the corresponding room.

While trinkets are fairly common, there is always a chance one doesn't appear naturally. This chance can be avoided by clearing three boss rooms without taking damage, which is guaranteed to cause Perfection Perfection to spawn.

Be careful about holding Myosotis Myosotis, as the trinkets left in boss rooms may instead be brought to the next floor, ruining your chance to get a cracked key, though you COULD just drop Myosotis instead.""

[Fleksiu]

Ok, word "any" means that it'll count? I can't leave the trinket I am holding now because it is necessary for me to keep it.

[Fleksiu]

Cracked key spawned, it works.