Summary

If you try to build a table via the new issue detail view, the final result will be in plain text:

But if you go to the issue view and comment the very same table, it will work:
 

It will even display correctly in the detail view:

It is the same behaviour with the description field.

Environment
Jira Cloud

Steps to Reproduce

• In a board view, click on a card (issue):
  • Build a table in the comment field:

    Test	Task
    	Test able rendering

• • Click on Save and check that the result is in plain text.
• Now in the view screen of the very same issue, comment the same table. You will see that it will render correctly;
• Get back to the issue's detail view, the last commented table will be correctly rendered as well.

Expected Results
The table should render when you add a comment via the detail view as well.

Actual Results
When commenting via the detail view, the result is plain text.

Workaround
Add the table via the issue view screen.