

It’s certainly difficult to do. And not likely something that needs to be fixed. But it’s at least possible it was a simple accident.
You tumble in head first, get knocked out hitting the bottom, then drown. That seems the most obvious way this can happen.
It’s really unlikely. And happening once isn’t a reason to change anything. But unlikely things happen all the time.




You’re right. All the debts and all the credits add up to zero. Thus all the actual money, adds up to zero.
In your example, the interest on the loan the central pays back, is just a debt on someone else’s balance sheet, offsetting the credit that was given to the central bank. So it too balances to zero.