Debt securities liquidity

As long term debt securities are very less liquid so how debt fund manages provide liquidity to their customers for their pre calculated NAV. Say for example if many people start redeming the units at the declared Nav by the AMC and if they don’t get the buyer in the market then they have to sell the units at very cheap price.Then how do the AMC py bck to their customer.

That’s what happend to franklin.
Now see the results.