I also enabled DESS yesterday (Green mode) and today got tthat battery 2 grid for 3 hours. I think it is because dess estimated that it will be more consumtion and therefore tried to get to that SOC.
I created a thread here for it.
And it seems when reading this thread the “hack” will not make it go away.
PS! I used tonight 02:00-06:00 gridsetpoint to charge my batteries because DESS was not planning to do it itself. I preffere to keep my batteries charged and not empty as DESS would do.