Unable to use .set-or-replace inside a .create function in Kusto

.create-or-alter function with (folder = "Validation") SaveValidate() 
{
   .set-or-replace ValidationResults with (tags='["new"]') <|
   Validate
} 

A recognition error occurred. Token: .

Line: 2, Position: 0

clientRequestId: KustoWebV2;ccc2de76-4cb5-481a-a593-1857215fd8fb