I had my 2018 September use year banked points reallocated today to an existing reservation in mid-November. Also had points that were borrowed from 2021 "un-borrowed" as they will be replaced in a Summer 2020 reservation with 2019 banked points that are now freed from the reallocation of the 2018 points. The cascade of changes is a bit hard to describe. I'm glad now that all my "oddball" point cases are dealt with for the time being.
I do have an Aulani reservation for late November using other 2018 points that I rented out which is getting concerning, but not much I can do on that but wait and see what happens...