Problem restoring to editor after pasting any text and saving it to database

[Ademgenc53]

Hello,
I'm using PHP and PDO, I am very happy with this editor, except one problem, no other problems
OR
I'm doing wrong somewhere

When I write and save text in the editor, there is no problem loading text back into the editor.
However, when I copy text from anywhere and paste it into the text editor and save it, the text is not restored inside the editor
OR
Text is not restored inside the editor even when there is only text in the database(without any html tags)

I'm trying both options

echo addslashes($read['content_text']);
echo $read['content_text'];

<textarea id="txtEditor3"></textarea>
<textarea id="content_text" name="content_text" style="display:none;"></textarea>

<script language="javascript" type="text/javascript">
  $(document).ready( function() {
    $("#txtEditor3").Editor();
      $("#txtEditor3").Editor("setText", "<?php echo addslashes($read['content_text']); ?>");  // From the database into the editor
        $("input:submit").click(function(){
          $('#content_text').text($('#txtEditor3').Editor("getText"));
        });
   });
</script>

Column in PDO database
'content_text' longtext COLLATE utf8_general_ci DEFAULT NULL

I am writing to the database in this way

        $sql = $PDOdatabase->prepare(" UPDATE table SET content_text=? WHERE id=? ");
        $sql->execute([$_POST['content_text'], '1']);