'Always collapsed, requiring a click to open' hides text in textarea

[a-ok]

I find that if I have 'How should this field be displayed in the editor?' selected as 'Always collapsed, requiring a click to open' for a repeater field, and the repeater contains a text area (specifically ckeditor) then more often than not the text area is blank/hidden (if I view source the text is there).

Any thoughts?