Assignment grading table reset button does not clear persistent settings

Steps:

• After creating an assignment with multiple users visible in the assignment grading table, use the first name or surname filters to exclude some or all of them.
  • NOTE: You will need enough users to fill more than one page in the grading table or the first / last name filtering won't show up. The default is 10 users per page, so you'll need 11 users. You can modify the "get_assign_perpage" function in mod/assign/locallib.php to set it to a lower value (say 5) if you don't want to create additional users.
• Navigate away from the page.
• Return to the Assignment grading page.
• Notice that the settings have been retained.
• Click the "Reset table preferences" button.
• Notice that the filters previously set have been cleared.
• Navigate away from the page again.
• Return to the page.

Expected result:
Table filters should be clear with none still applied.