Reading around here, testing, looking in the game and asking elsewhere it seems you can’t roll both “vs chaos” and “vs skaven” at the same time on charms anymore. People have spent several hundreds of dust but never get it after 1.1. However, there are those who got it before 1.1 and they have been able to keep it. I don’t know if this is a bug or intentional so it’s hard to argue if it should still be possible to roll it or not. Might be worth looking into regardless.
Regarding melee, it’s the same. You can’t roll both those properties on the same melee weapon, it’s probably been this way all the time but I didn’t think about it until recently. Now this doesn’t seem quite fair though. Especially considering ranged weapons gets to choose sub-categories like “vs armored” and “vs monster” instead. Which lets them stack power vs up to 40% (44) against certain enemies when paired with a charm. Considering properly spec’d ranged is vastly stronger than any melee I can’t see why it shouldn’t be “fair” to let melee roll both these properties on the same weapon. It won’t even necessarily become the 100% meta as both crit and attack speed can easily be favored over it for DPS or utility. I just think more options are better, especially for melee specialized characters.