Probably not, it is not your house or your money. But, just to ease your mind i had a similar situation a while back where the bank started doing some repairs just as we were in negotiation. I had similar worries. We continued because I knew that once the work was completed ther would be other buyers bidding on this home that was now all fixed-up.
The bank completed the work. They probably already contracted to have it done and were not about to cancel. What if my Buyer's deal fell through? They would have to start all over again.
By the way, my Buyer got a great deal!