Error using RichTextBox control with right-aligned bullets on Windows 11 24H2

[Nora-Zhou01]

.NET version

10.0.100-alpha.1.24573.1

Did it work in .NET Framework?

Yes

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No, repro in .NET 8.0

Issue description

Error using RichTextBox control with right-aligned bullets on Windows 11 24H2

Windows 11 Enterprise 24H2

24H2.mp4

.NET 10 (.NET 9.0 with the same results)

.NET 8

Windows 11 Enterprise 23H2

23H2.mp4

Steps to reproduce

1. Create a Winforms .Net Core application and add RichTextBox and Button controls
2. Set the Text of the RichTextBox to test
3. Double-click the Button and add the following code

this.richTextBox1.Text = "test";

richTextBox1.RightToLeft = RightToLeft.Yes;

richTextBox1.SelectionBullet = true;

5. Run the project on both Windows 11 23H2 and 24H2

Or

1. Launch the WinFormsApp5.zip project
2. Run the project on both Windows 11 23H2 and 24H2

More Info:
The issue is from customer feedback ticket: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2316184

[sohailaboebs]

I have almost the same issue, below is a description of what I had:
I am using Windows 11 and Microsoft Visual Studio to [C# Windows Forms] applications
I have a RichTextBox control that has rich text inside it
After updating to Windows 11 [24H2] I had an issue with filling the rich text box with text, below are the steps that cause the issue:

Start Visual Studio[Microsoft Visual Studio Community 2022 (64-bit) - Current]
Create a Windows Forms Application and Use .Net 8.0
Add a rich text box to the form
Add a button and put the code below in the button event handler:
private void button2_Click(object sender, EventArgs e)
{
this.richTextBox1.Text = “This is a test”;
richTextBox1.RightToLeft = RightToLeft.Yes;
richTextBox1.SelectionBullet = true;
}
You will get the exception below:
System.AccessViolationException: ‘Attempted to read or write protected memory. This is often an indication that other memory is corrupt.’
Rolling back to [23H2] clears this issue, please solve this bug

For my issue it looks like something went wrong when my Windows 11 updated to "Windows 11 [24H2]", almost on the same day or around it Visual Studio also had an update, one of these updates caused this issue, rolling back to "Windows 11 [23H2]" cleared this issue, the issue is related to the update, I am using [.Net 8.0] and I am using [Windows Forms and C#]
Thank you

[merriemcgaw]

@Nora-Zhou01 , does this happen in Framework on the same Win11 builds? Is there a .NET release where it did work? We'd also like to see if this happens in MFC apps. Is there other formatting where this has the exception (numbered, bold, italics) ?

[Nora-Zhou01]

@Nora-Zhou01 , does this happen in Framework on the same Win11 builds?
Is there a .NET release where it did work? We'd also like to see if this happens in MFC apps. Is there other formatting where this has the exception (numbered, bold, italics) ?

Does not repro in the same Win11 24H2 version of the Framework and MFC project. The issue does not repro when setting other formats of the RichTextBox. I tried VS2019 16.5 and this issue still repro.