Some of it would remain and protrude and have to be sanded down to avoid injuries, then possibly painted or otherwise treated to prevent rust. The only viable solution to this problem is ensuring that the right kind of benches are installed in the first place.
The United Kingdom, along with France, ceded Czechoslovakia’s Sudetenland to Hitler’s Germany, not Poland; in fact, it was the Nazi regime’s invasion of Poland the following year that prompted France and the United Kingdom to declare war.