Solar export and charging battery arrangement under VPP

[EY1]

I am in SA and with AGL VPP for most 8 years. Normally the battery (Powerwall 2) will be charged from solar until it's full then the remaining solar power will be exported to the grid. I noticed since a few days ago, the solar will be exported as priority. The solar generated power is not going into the battery until after 3:00pm or 3:30pm.

After that time, the operation will return to normal i.e the solar will charge the battery.

I am wonder whether it is part of the AGL VPP strategy of controlling the battery. Does anyone noticed this? Perhaps someone from AGL can answer this.