Why does it work this way?

[Wing-Span]

Many abilities do not work on summoned units. Including chain lightning and hex. I guess there is no way to get rid of this?

I noticed that units raised from the dead are not considered summoned units. However, after hex is applied to them, they are considered summoned by the warcraft engine. WTF???

 

[Uncle]

Many abilities do not work on summoned units. Including chain lightning and hex. I guess there is no way to get rid of this?

I noticed that units raised from the dead are not considered summoned units. However, after hex is applied to them, they are considered summoned by the warcraft engine. WTF???

I'm 99% certain that Chain Lightning can target summoned units, but the rest sounds correct. I don't think there's anything you can do about Hex but for the Raise Dead issue you could have a trigger that removes their Summoned classification after they've been Hexed (potentially need a 1 frame delay depending on when the classification changes).