This kind of situation is called breach of contract, which can't be said to be common, but it still exists relatively.

As for the result, there are two main points.

One is that the other property rights of the house are in the hands of the bank, and the bank will apply for auction of the property to recover the loan when it is unable to repay the debt. After paying off the loan, the surplus belongs to you. However, it is usually auctioned first and then at a reduced price, so it is basically impossible to sell the house at the market price, so you will have no money to take it after paying off the loan.

The second result is that you will lose the down payment when you buy a house. This should be considered clearly. Once the supply is cut off, it means accepting the loss of the down payment.

I don't think anyone will want to lose the down payment for nothing, even if they have to. So I suggest you find an intermediary and entrust them to operate on your behalf to help you sell the house. Although it will cost tens of thousands of dollars, it is much more cost-effective than direct loss of down payment.