CSV Export of Grouped Multi-Select Fields

Hello!

I believe I've run into a bug in Webform's CSV export functionality, particularly when dealing with select fields that (a) allow multiple selections, and (b) include groupings in the Options field. The resulting CSV file includes headers for the option groupings, but not for the options themselves, resulting in missing data.

To reproduce, try creating two "select" components in a Webform, each allowing the user to select multiple values. On the first, enter a set of options without groups, i.e.:

Apples
Oranges
Broccoli
Carrots

On the second, enter the same option set with groupings:

<Fruit>
Apples
Oranges
<Vegetables>
Broccoli
Carrots

Submit the form a few times to get some test data going; then, download a CSV or TSV export of the data. I did this test myself with about five form submissions; each time, I submitted identical value sets for each field. The CSV results are attached (as a TXT file; I had to change the extension to upload it here); as you can see, the "favorites1" field (without option groupings) has all its data intact, but the "favorites2" field (with option groupings) only lists the option groupings as values, and none of the data.

Is this the expected behavior? Or is there a setting I'm missing that will allow the missing data through to the CSV export?

Thanks!