• VSCode Version: 1.41
• OS Version: Windows 10 Enterprise

Steps to Reproduce:

1. Write singleline html tag, e.g.:

<div></div>

2. Put cursor inside tag name. Cursor is mirrored as expected
3. Press duplicate line (alt+shift+down). This results in three html line

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

When cursor is not inside tag name everything is ok

Does this issue occur when all extensions are disabled?: Yes