Looked into this issue and the problem is there is a limit on the size that a cursor image can be, it needs to be less than or equal 256x256 pixels. The rbxassetid you are attempting to use has an image size of 420x420 pixels.
I’ll add a warning that notifies you if the image is too large, and use a center crop in order to show something. This would just work in your case, since you have a lot of empty space around your cursor.