This really isnt anything new with 3.9, I can not confirm if the BAI does this in vanilla, but I started playing FoTS with 3.4 and it is pretty common for them to do this on normal. I do not see the general charge as much with Hard difficulty, but when they do the charge they seem to do it when all my melee is tied up, which is a very smart move.
I know a General vs line/levy infantry, if the general can charge without taking any fire once they are in melee the general will win every time with minimal deaths, so in theory the charge is a solid move, they just shouldn't do it until the timing is better and I cant just charge my Yari into the general unit...