MSHTML IHTMLTxtRange.pasteHtml() and FEATURE_BROWSER_EMULATION=11001 => wrong html

If I enable emulation of IE11 for my application in registry here:

HKCU\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION\myAppName.exe

and insert html into WinForms WebBrowser control using function IHTMLTxtRange.pasteHtml(), then text between html elements is interpreted probably wrong:

-spaces transformed to <p> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p>

-line breaks between html elements transformed to <br/> tags.

As a result I get wrong html.

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Test application:

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Form1.cs:

public partial class Form1 : Form
    {
        public Form1()
        {
            //enable IE11 mode
            string fileName = System.IO.Path.GetFileName(Process.GetCurrentProcess().MainModule.FileName);
            using (RegistryKey key = Registry.CurrentUser.CreateSubKey(
                @"Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION",
                RegistryKeyPermissionCheck.ReadWriteSubTree))
            {
                key.SetValue(fileName, (UInt32)11001, RegistryValueKind.DWord);
            }
            
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //enable design mode
            webBrowser1.Navigate("about:blank");
            IHTMLDocument2 mshtmlDoc2 = webBrowser1.Document.DomDocument as IHTMLDocument2;
            mshtmlDoc2.designMode = "On";
            
            
            //insert html
            while (mshtmlDoc2.readyState != "complete")
            {
                Application.DoEvents();
            }
            mshtmlDoc2.body.innerHTML = "<p>paragraph 1</p>";
            IHTMLTxtRange bodyRange = (mshtmlDoc2.body as IHTMLBodyElement).createTextRange();
            bodyRange.collapse(Start: false);
            bodyRange.pasteHTML("<p>paragraph 2</p>\n\n\n        <p>paragraph 3</p>");

            //show result html
            textBox1.Text = webBrowser1.DocumentText;
        }
    }

----------------

Form1.designer.cs:

partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.webBrowser1 = new System.Windows.Forms.WebBrowser();
            this.button1 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // webBrowser1
            // 
            this.webBrowser1.Location = new System.Drawing.Point(12, 12);
            this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);
            this.webBrowser1.Name = "webBrowser1";
            this.webBrowser1.Size = new System.Drawing.Size(626, 190);
            this.webBrowser1.TabIndex = 0;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(12, 338);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(143, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "Insert html";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(12, 208);
            this.textBox1.Multiline = true;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(626, 124);
            this.textBox1.TabIndex = 2;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(652, 373);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.webBrowser1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.WebBrowser webBrowser1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox textBox1;

    }

------------

As a result I get the following html which, I think, is wrong:

<P>paragraph 1</P>
<P>paragraph 2</P>
<P><BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </P>
<P>paragraph 3</P>