Question about bonds, not necessarily CFA question interest, question, principal, difficulty, payments

prav_Cfa7

Lets say I buy a $1000 bond for 80% of par value. The debtor is having a rough time and is having difficulty making interest payments and is distressed.
At the end of the bond’s term, would the owner of the bond get a principal pay back of $1000, $800 or would the lender and borrower work out some kind of principal payoff agreed upon by the two parties?