Profile custom field option: "Include in multi-record listing" un-ticked, but still persists

Wordpress 4.4.2 Civi 4.7.2 and just recreated on wpmaster with 4.7.4

When creating a multi-value custom data set, then a profile for listing and adding new entries, selecting the "Include in multi-record listing" option works for a custom field, but subsequent removal of this option does not remove it. The option persists.

Recreated on current WordPress demo: http://wpmaster.demo.civicrm.org/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fadmin%2Fuf%2Fgroup%2Ffield&reset=1&action=browse&gid=14

Workaround is to patch the record in civicrm_uf_field using the following SQL:-

update civicrm_uf_field
set is_multi_summary = 0
where label = 'Field Label';

In our case "Field Label" is unique, but would be better using ID.

Thanks,
Darren