When the Blazor Web Report Designer is closed and then reopened, some of its resources are not loaded the second time around, causing the resize handles to break.

Making sure the following resources are always loaded on the web designer page, resolves the issue.

• <script src="/api/reportdesigner/designerresources/ext_js/jquery.ui-1.12.1.min.js/"></script>
• <link type="text/css" rel="stylesheet" href="/api/reportdesigner/designerresources/ext_styles/jquery.ui-1.12.1.min.css/">