During the initial execution, the code behaves as expected, but after invoking setState, the FloatingTopChanged and FloatingLeftChanged events stop firing. Removing the DockPaneDemo item from localStorage and reloading the page restores the expected event behavior.

sample project attached.

<div class="k-form-field">
    <label for="dosFrom">@Label From</label>
    <TelerikDatePicker
        Id="@($"{Id}-dosFrom")"
        @bind-Value="@DateTesting"
        Format="MM/dd/yyyy"
        Class="@($"{Id}-dosFrom calender-picker")">
        <DatePickerFormatPlaceholder Year="YYYY" Month="MM" Day="DD" />
    </TelerikDatePicker>
</div>

{{ @DateTesting }}

<TelerikButton
    ButtonType="Telerik.Blazor.ButtonType.Reset"
    OnClick="() => ClearDate()">
    Clear
</TelerikButton>

public DateTime? DateTesting { get; set; }

private void ClearDate()
{
    DateTesting = null;
}

<TelerikForm Model="@Account"
             OnValidSubmit="@OnSave"
             OnInvalidSubmit="@OnInvalidSubmit"
             Class="gsi-margin-10">

    <FormValidation>
        <DataAnnotationsValidator />
    </FormValidation>

    <FormItems>

...

        <FormItem Field="@nameof(Account.theValue)">
            <Template>
                <LabelFor Model="@Account"
                          DisplayName="Text Value" />

                <TelerikNumericTextBox @bind-Value="@Account.theValue"
                                       Format="C"
                                       Max="5m" Min="-5m"
                                       Step="0.33m" />
            </Template>
        </FormItem>
    </FormItems>

        [NotMapped]
        public decimal theValue { get; set; } = 1.234m;

<TelerikWindow Visible="@ShowEditPopup"
               Modal="true"
               Draggable="true"
               Resizable="false"
               MaxWidth="350px">

    <WindowTitle>Edit Method</WindowTitle>
    <WindowContent>
        <div>
            <label>Description:</label>
            <TelerikTextBox @bind-Value="@EditingMethod.Description" />
        </div>
        <div>
            <label>Is Run:</label>
            <TelerikCheckBox @bind-Value="@EditingMethod.IsRun" />
        </div>
        <div>
            <label>Run Frequency Minutes:</label><br />
            <small>4 Hours: 240, 12 Hours: 720, 24 Hours: 1440</small>
            <TelerikNumericTextBox @bind-Value="@EditingMethod.RunFrequencyMinutes"
                                   Min="5"
                                   Max="1440"
                                   Step="5"
                                   Decimals="0" />
        </div>
        <div>
            <TelerikButton OnClick="OnSavePopup">Save</TelerikButton>
            <TelerikButton OnClick="OnCancelPopup">Cancel</TelerikButton>
        </div>
    </WindowContent>
</TelerikWindow>