If a waitlist fills during 7 months window then any available points can and will be used.
I’ve tried that several times.
I’ve chatted with ms about it and was told that since I used my home resort priority window to create the WL then home resort points would be used - but as with many things else this is not the case in the real world.
It also wouldn’t make sense if you are forced to use home resort points at 7 months. Rules states that during non home resort priority window any type of points can be used.
Also they would need to rework the IT system as 7 months reservations don’t have the “lock” on contracts.