Dragable link from pallete to canvas not validating and even not connecting to node when apply linkvalidation

GoJS
1

when drag the link from node to node is working fine, but when drag the link to canvase not validating.

private linkValidation(tool) {
      tool.linkValidation =  function(fromnode, fromport, tonode, toport) {
        // total number of links connecting with a port is limited to 1:
       
        if(fromnode.findLinksBetween(tonode).count < 1) {
          return true
        } else {
          return false
        }
      }
  }

public ngAfterViewInit() {
 this.linkValidation(this.dia.toolManager.linkingTool);
    this.linkValidation(this.dia.toolManager.relinkingTool);
}```
2

When I add this line to the initialization of the RelinkingTool in the Draggable Link sample, it properly outputs “relinking” to the console when I drag a link from the Palette to the main Diagram.

"relinkingTool.linkValidation": (fn, fp, tn, tp) => { console.log("relinking"); return true; },