I just did an unscientific test and from what I can see it’s has something to do with the transferred points being bookable at the 11 month window as
@JackosinDIS mentioned.
However not only am I able to use my transferred in points during the 11 month window by myself, I’m also able to book at resorts which I received points for when I bought OTUP, in my case Poly and VGC. That is hardly intended.
Currently I can book at the 11 month window for transferred in points and OTUP but unfortunately not at the resort I own at with the exception of AKV Jambo.
ETA: I expect the option to use transferred in points by yourself during the 11 month window to go away again.