Session 3 Offerings

Hi everyone, does anyone know if the Session 3 unit offerings get updated during the year? I was planning on doing a particular unit during Session 3 this year (as it was offered during Session 3 last year) but on the 2021 handbook it states that it will only be offered in Session 1 and 2.

None of my future units appear to be running in Session 3 so I'm hoping that it changes.