Firstly give the gingerbread team a ring on their helpline as they will have the most up to date information.
It’s worth noting that the High Court has ruled against the DWP for the situation that you’re now in. If you Google R(on the application of Johnson and others) v Secretary of State for Work and Pensions(2019) EWHC 23(Admin)(11 January 2019) it should bring up the details.
Did you manage to get a decent outcome from the mandatory reconsideration?
I was expecting to be in the same situation in dec/jan due to work paying early for xmas but it looks like work have paid me early for some reason this month too! so will be in the same situation by 2nd Nov!
There is another thread that another poster has given a lot more information which is definitely worth looking up. If you can’t find it let me know and I will find it for you(I’m away at the moment on holiday)