.NET 6 Kendo UI form validations using kendo-rules attribute - asp.net-mvc

Question

I am new to kendo UI. Trying to validate my form using custom rules with kendo-rules attributes. I am referring to this link https://demos.telerik.com/aspnet-core/validator . The custom rules are working but somehow the validation message is getting triggered on different controls.
I am trying to set the custom rule on my "FirstName" field. If "FirstName" field has value less than 5 characters then, validation message "First name cannot be less than 5 characters" should come, for "FirstName" field.
However, I am getting the validation messages on different controls. Refer to the snapshot below.
The expected behaviour is , first required field error should come and then if the user enters first name value less than 5 characters then this "First name cannot be less than 5 characters" error should come.
Here is my code:
Create.cshtml
#model KendoFormValidation_Demo.Models.Person
#{
ViewData["Title"] = "Create";
}
#{
var messages = new Dictionary<string, string>() { { "custom", "First name cannot be less than 5 characters" } };
var rules = new Dictionary<string, string>() { { "custom", "customFunction" } };
}
<div class="row">
<div class="col-md-4">
<form id="PersonForm" kendo-validator="true" kendo-messages="messages" kendo-rules="rules">
<div class="form-group">
<label asp-for="FirstName"></label>
<input asp-for="FirstName" class="form-control" />
<span class="text-danger k-invalid-msg" data-for="FirstName"></span>
</div>
<div class="form-group">
<label asp-for="LastName"></label>
<input asp-for="LastName" class="form-control" />
<span asp-validation-for="LastName" class="text-danger k-invalid-msg" data-for="LastName"></span>
</div>
<div class="form-group">
<label asp-for="Age"></label>
<input class="form-control" for="Age" />
<span asp-validation-for="Age" class="text-danger k-invalid-msg" data-for="Age"></span>
</div>
<div class="form-group">
<label asp-for="Address"></label>
<input asp-for="Address" class="form-control" />
<span asp-validation-for="Address" class="text-danger k-invalid-msg" data-for="Address"></span>
</div>
<div class="form-group">
<label asp-for="Email"></label>
<input asp-for="Email" class="form-control" />
<span asp-validation-for="Email" class="text-danger k-invalid-msg" data-for="Email"></span>
</div>
<div class="form-group">
<label asp-for="Phone"></label>
<input asp-for="Phone" class="form-control" />
<span asp-validation-for="Phone" class="text-danger k-invalid-msg" data-for="Phone"></span>
</div>
<div class="form-group">
<label asp-for="Dob"></label>
<input asp-for="Dob" class="form-control kendo-date-picker" />
<span asp-validation-for="Dob" class="text-danger k-invalid-msg" data-for="Dob"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="k-button k-button-md k-rounded-md k-button-solid-primary" />
</div>
</form>
</div>
</div>
<div>
<a asp-action="Index" class="k-button k-button-md k-rounded-md k-button-solid">Back to List</a>
</div>
<script>
function customFunction(input) {
debugger;
return input.attr('name') === "FirstName" && input.length<5;
}
$(document).ready( function () {
$(".kendo-date-picker").each(function(){
$(this).kendoDatePicker({
format: "MM/dd/yyyy",
dateInput: true,
value: $(this).val()
}).data('kendoDatePicker')._dateInput.setOptions({
messages:{
"year": "yyyy",
"month": "mm",
"day": "dd"
}
});
});
var validator = $("#PersonForm").data("kendoValidator");
$("form").submit(function(event) {
event.preventDefault();
if (validator.validate()) {
alert("Success");
} else {
alert("fail");
}
});
});
</script>
Person.cs
public class Person
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
public string Address { get; set; }
public string Email { get; set; }
public string Phone { get; set; }
[DataType(DataType.Date)]
public DateTime Dob { get; set; }
}
I am using .Net 6 and Telerik version: ASP.NET Core R2 2022 SP1
Can anybody help me on this? Did I miss anything here.
Thank You