Did Lucas forget that Obi Wan served Bail Organa in the Clone Wars ?
I don’t think this plot line mentioned in the originals was revisited.
It would appear Lucas did indeed forget, or didn’t care. But given the large number of discrepancies between the two trilogies onscreen at the time it is one that is often overlooked.
I do love the deep mental gymnastics by some to try and align the discrepancies, and some of the excuses and justifications are pretty good and thoughtful, yet often fall apart in the overall scheme of things. It would be interesting to see such efforts put into explaining George why he didn’t simply write a more coherent Prequel Trilogy for his Saga. Or why he didn’t address the many discrepancies in the drafts or re-writes before filming began.