https://stackblitz.com/edit/angular-ivy-dm6eem?file=src%2Fapp%2Fapp.component.html,src%2Fapp%2Fapp.component.ts,src%2Fapp%2Fdrag-and-drop.directive.ts

The drag-and-drop directive implemented in the current project does not work as desired. Undefined is being printed as the name of the item, not the name of the changed item. I need advice on the cause and solution.