You are correct and I was wrong. I must have somehow missed that abbreviated second season because it happened shortly after I graduated college and moved across the country. There's also the matter that the show simply wasn't very good, and that perhaps also made it easy to forget that the second season ever existed.AfterMASH had a second season but it was only 10 episodes and was canceled early: https://en.wikipedia.org/wiki/AfterMASH#Episodes