Its not, it's the liability of the estate and the responsibility of the relevant accountable person named on the application when the application was submitted to ensure it is repaid. The relevant accountable person is only liable in the event of fraud or where the relevant accountable person distributes the assets without the permission of the HSE.
Assuming you are the relevant accountable person, it is your responsibility to ensure that the estate, via the executor, (and yes, I know this is yourself also) repays the loan via the estate.
The estate and the beneficiaries are not the same thing.