Make a table, put some text in a cell. Save. Highlight the text, add an inline comment. All works well.

If somehow in the code the text gets wrapped in a span tag (don't know how this happens in the editor, but I think it's when you copy from elsewhere), adding an inline comment doesn't work and it gives you a very unhelpful message about 'it might be a macro try highlighting plain text'.

Only way I could make it work was retype the text manually in a new cell - copy and past just brings the span tag with it.

Ideally this would just work or, if hard to implement, tell me to retype the text to make it work.