It seems the new editor has lost its ability to insert tables at any indentation level.
If I create a list element and click to create a table within it, the table always gets created AFTER the ENTIRE list.
I tried various workarounds, including using Tab to indent the table, copying-and-pasting the table in position, and pasting properly formatted Markdown, but none of it worked.
Nesting tables in list elements is basic HTML functionality. Not supporting it is an authoring crime.