Same as it was before 1.63 beta fix in ArmA2 AI armed with an anti-tank weapon would needlessly run point blank to the APC or Tank instead of just blowing it up the moment it sees it.
In ArmA2 this led to a fix of a bigger issue where AIs were constantly and needlessly closing in on enemies until they were at a point blank distance exposing themselves which is probably what happens in ArmA3 too
https://dev-heaven.net/issues/32115 {F21101}