What happens to an individual's educational benefits, after they get an honorable discharge in active duty but a dishonorable in the guard?

A Dishonorable Discharge has to be given as the result of a General Court-martial and means that all military and VA benefits halt. They sometimes will allow the individual to retain a retirement if they are due one, but that usually only happens if there is family involved.
I have never seen a Dishonorable Discharge that didn't involve a felony conviction.

Can I ask why you are getting a dishonorable discharge in the guard? I had an issue in the guard that was leading down that path but there are ways around it and you can fix whatever issue there is to receive an honorable discharge.

I'd say call the VA directly, email DAV, and talk with seasoned NG/R Vets like LTC John Shaw to fact-check each other.