Just checked my accounts. The 'non-autoconvert-to-BA' account is still showing my points - this was the account my paid points went into. The other account, where I transferred my 'bonus' points, has been cleared out.

Obviously I have no complaints. However, I hope that Marriott returns the points to the MR account from the reversed Tesco transactions in order to clear my overdraft and return my MR status to normal.