Yeah I just had a whole mess up of points allocation related to this. I subtracted a night from our upcoming December trip (went from 4 nights down to 3 at VGF) and those points ended up being returned into the prior Dec 2024 UY, which should have been impossible since I had already banked those points ahead and the reservation was already booked within the next Dec 2025 UY.
I then (likely making things worse), for the 2nd time now, banked the incorrectly returned points back into the Dec 2025 UY, which, again they already HAD been in that UY in order to make our initial reservation. I then re-booked the same 3 nights since I wanted to make sure those Dec '24 points (that I've now re-banked) would be used for the reservation.
Well, that screwed EVERYTHING up. All of a sudden it's showing that the 86 points I SHOULD have remaining in our Dec 2025 UY are now showing as 86 Dec
2023 points, rendering the points unbankable. We've definitely already used all of our 2023 points lol but the IT department has been working on this issue for over 3 weeks now and still nothing has changed after spending over 2 hours on the phone with MS over a series of 3 calls trying to sort this all out. I guess it's good to know I'm not the only one this happened to.
Anyway, end of mini-rant, and I'm glad I found this thread.