RT mode displays weirdly content made from HTML paragraph and HTML comment tags

[quan1506]

Describe the bug
A combination of HTML p tag and comment tag in the MD mode are display weirdly in RT mode:

• The p content is overlapped with the editor empty state's placeholder text
• The text is wrapped in a blue border box
• The text is uneditable. Inserting new words make the whole text be removed.
• Even back to the MD mode to remove the HTML comment, the issue is still remaining.

To Reproduce
Steps to reproduce the behavior:

1. In MD mode, insert this:

<p>A paragraph.</p>
<!--This is a comment -->

2. Back to RT mode and see the error:
   

Expected behavior
The RT display shouldn't be affected by the HTML comment tag. Display p tag element with or without HTML comment should be the same.

Desktop (please complete the following information):

• OS: macOS
• Browser Chrome
• Version 103.0.5060.114 (Official Build) (arm64)

Additional context
I also reported the issue in the Feedback Stack editor thread here.

[Justin-MSE]

The p content is overlapped with the editor empty state's placeholder text.

Are there any plans to include placeholder text in the Stacks editor that is being used on SE? Currently, it is only visible in the demo editor. @b-kelly

[b-kelly]

@Justin-MSE That would depend on the teams in charge of implementation on that side of things. Enabling this feature is fairly trivial though, so I'll mention it to the folks that are making the changes there so we can ensure it gets added.