when editing a profile, Advanced options get erased if not dropped down

When editing a profile in which you have previously set some of the check boxes under Advanced Options, if you click Save WITHOUT first opening up the advanced options, those settings are erased.

The "Limit listings to a specific Group?" drop down seems to stick, at least, but all the checkboxes I tested ("Drupal user account registration option?" on down) are affected by this problem.

Verified on 2.1 demo site.