My migration path was Quicken 2007 to Quicken Essentials, then 2015/2017/2018/2020/2022, so things might have been different for me, but my Memo/Notes came through for all accounts, back to January 1, 1993.
Also, as far as I know, the fact that some accounts did not have Memo/Notes checked when you upgraded should not have mattered – those View options just change which data are displayed, not the database itself.
What happens if you check Memo/Notes for the affected accounts now?