Twin Beam for disintegrate bugged?

I just jumped onto a legacy level 80 mage I had, and noticed his disintegrate skill points had been refunded, I guess because the skill had been reworked since I last played the character. So I re allocated the points, including twin beam, and extra range, but it doesn’t look like either worked. I even logged out and in again, but the beam is still a single beam, and the range does not look longer…

Any ideas ?

It likely also reset the passive tree. So it lets you use the skill (which it shouldn’t) but it won’t use the skill tree because you haven’t “unlocked” it yet.