What happens if you loaned out 1 BTC worth $65k

And the cost of 1 BTC rises to $1m, before the borrower can pay it back

Is the borrower just fucked? Or how would that play out?

Is than an intended feature of Bitcoin?

So that we’re incentivized NOT to lend money to each other, knowing deflation is inevitable and it might be impossible for the borrow to pay back that same slice of the pie in the future?

Idk