Asp.net Publish Sonrası Updatepanel Sorunu

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" EnableCdn="true" runat="server"></asp:ScriptManager>
  
  <asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" ChildrenAsTriggers="true" runat="server">

<ContentTemplate>

<asp:DataList ID="rpt" RepeatColumns="1" RepeatLayout="Flow" runat="server">
<ItemTemplate>

<div class="panel ">
<blockquote class="blockquote">
<div class="row no-gutters">

<div class="col-md-4">

<img src="<%# Eval("yazi_resim_url") %>" class="img-fluid" style="padding-right: 10px; min-height: 100%;" alt="Alternate Text" />

</div>

<div class="col-md-8">

<h3><%# Eval("yazi_baslik") %></h3>
<h4 class="">
<%# Eval("yazi_icerik").ToString().Substring(0,1) %> ...

</h4>
<h5 style="color: White;" class=""><i class="tim-icons icon-tap-02"></i>
Okunma Sayısı : <span><%# Eval("yazi_okunma") %></span>
<br />
<i class="tim-icons icon-time-alarm"></i>
Yayınlanma Tarihi : <span><%# Eval("yazi_yayin_tarihi") %></span> <a href="/blog/icerik-<%# Eval("yazi_url") %>" class="btn btn-info pull-right">Devamını Oku ...</a> </h5>

</div>

</div>
</blockquote>
</div>


</ItemTemplate>
</asp:DataList>


<asp:Button CssClass="btn btn-outline-darker" ID="btnnext" runat="server" Text="Daha Fazla Göster"
OnClick="btnnext_Click" /></td>


</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnnext" />
</Triggers>

</asp:UpdatePanel>

</form>

<?xml version="1.0"?>

<configuration>
[B]<configSections>
<section name="ajaxControlToolkit" type="AjaxControlToolkit.AjaxControlToolkitConfigSection, AjaxControlToolkit"/>
</configSections>[/B]

<system.web>
<pages validateRequest="false" enableViewStateMac="false" viewStateEncryptionMode="Never" maintainScrollPositionOnPostBack="true" controlRenderingCompatibilityVersion="4.0">
[B]<controls>
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
</controls>[/B]
</pages>
<globalization culture="tr-TR" uiCulture="tr-TR"/>
<compilation debug="true" targetFramework="4.8"/>
<httpRuntime executionTimeout="120"/>
<customErrors defaultRedirect="/hata" mode="Off"/>
<trace enabled="false" localOnly="true"/>
</system.web>
<connectionStrings>
<add connectionString="Data Source=.\SQLEXPRESS;initial catalog=db; uid=sa; pwd=12345;" name="bag" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.webServer>
<httpProtocol>
<customHeaders>
<remove name="X-Powered-By"/>
<remove name="Server"/>
<remove name="X-AspNet-Version"/>
<add name="X-FRAME-OPTIONS" value="ALLOW"/>
</customHeaders>
</httpProtocol>
<defaultDocument enabled="true">
<files>
<clear/>
<add value="Default.aspx"/>
</files>
</defaultDocument>
<security>
<requestFiltering>
<verbs allowUnlisted="false">
<add verb="GET" allowed="true"/>
<add verb="POST" allowed="true"/>
</verbs>
</requestFiltering>
</security>
</system.webServer>
[B]<ajaxControlToolkit htmlSanitizer="AjaxControlToolkit.HtmlEditor.Sanitizer.DefaultHtmlSanitizer, AjaxControlToolkit.HtmlEditor.Sanitizer"/>[/B]
</configuration>