that rule doesn't apply to HSA's, to qualify as an HSA , The interest of an individual in the balance in his account must be nonforfeitable.
You have until April 15 in the year following the refund to repay the HSA and avoid the extra tax and penalty that should be paid if you were to keep the distribution that was not ultimately used for medical expenses. When you send the money to the HSA bank, you need to explicitly tell them that it is a mistaken distribution repayment, so that they can report it to the IRS correctly and it will not affect your contribution limits.
since the refund was received in 2019 and you used it in 2019 for qualified medical expenses, there is nothing to report.
