Projectile support gems is not working for summon skeletons

my guess...and this is just a guess here:

Dead Reckoning, being that it "no longer exists", does NOT add the "projectile" tag to the skeletons in the same way it did before. That tag is now exclusive to the "mages" summoned through the transfigured gems.

I can totally see this being a completely unintended effect, yet one that they are simply unable to fix as it might be baked into deleted code associated with Dead Reckoning.