I'd like to note this issue only happens when the regroup point is in open terrain.
I have been noticing a slightly inconvenient habit of the AI during staging for an attack. When the AI groups are regrouping and preparing to attack they do very little to save themselves from enemy fire. I sat beside one group watching them take fire from an enemy technical at about 650m away and they just went prone refusing to move.
This is by no means a huge issue as they usually react to infantry fire by engaging the enemy but when taking long range fire they seem to freeze up. It would be nice if they would attempt to retreat to cover when preparing an attack and taking fire (as this would prevent them from attacking without the commander being ready).