Webform redirect settings have no effect on front page

When we have validation errors on home page ,webform redirect settings have no effect .

Steps:
1. I create a webform with 1 required webform components.
2. I set the redirect page to be none.
3. I enable the option to create the webform block.
4. I configure the webform block to show only on the front page <front>, in the content region.
5. I view the home page and see the webform.
6. I try to submit it without filling in the required components, and I am redirected to the page of webform(node/1) with validation errors shown.
7. I fill in the required components and submit the form. I stay on front page with a new blank form shown in the block.
8.I configure the webform block to show only on the user/1 page, in the content region.
9. I view the user/1 page and see the webform.
10. I try to submit it without filling in the required components, and I stay on the user/1 page with validation errors shown.