Hey there!
There are actually 10 rabbits in the room, but you only have to collect 9 and then visit the room to put the last Rabbit on his Platform to get the shader.
According to d2checklist.com , you are missing Rabbit #3 which is the rabbit in the Archer's Line Area.
Here's a short video showing the location: https://youtu.be/b0QXVvrTa8Y
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You are amazing! Thank you