Subsequent to connectivity issues with an insulation, I found myself needing to change the accounts to manual and the re-adding the institution and relinking the original accounts.
After adding and linking the institution, I still showed accounts entries for both the linked account and the newly-readded institution. (Both as Savings accounts - NOT Manual).
Reckoning deleting and readding the institution again might help, I deleted the institution completely. However I now have an orphan account left behind with no corresponding institution or way to delete it.