material select not working with all options selected

After upgrading to version 4.5.9 I have a problem with the material select toggle option. When all items are selected via "select all" checkbox and I post the form, then the selected values are not posted. The behavior is as followed: - Select single or multiple options (not all) and POST => working fine - Select all options manually (without the "select all" checkbox) and POST => working fine - Click on "select all" checkbox and POST => no values are posted - Click on "select all" checkbox and deselect one option and POST => "select all" is unchecked but not values are posted Seems that the click on the "select all" checkbox causes that control to not provide the values for the POST, even if options are deselected/selected manually. Here´s the code snippet I used to reproduce:

Start your code here

<form method="post" id="options-form"> <select multiple="" searchable="Search..." class="mdb-select colorful-select dropdown-secondary" id="SelectedOptions" name="SelectedOptions"> <option value="" disabled="">Please select</option> <option value="option_value_0">Option 0</option> <option value="option_value_1">Option 1</option> <option value="option_value_2">Option 2</option> <option value="option_value_3">Option 3</option> <option value="option_value_4">Option 4</option> <option value="option_value_5">Option 5</option> </select> <button class="btn-save btn btn-flat btn-md" title="Apply">Apply</button> <div class="mt-4"> <button type="submit" class="btn btn-primary waves-effect waves-light">Save</button> </div> </form> <script type="text/javascript"> $(document).ready(function () { $("#options-form .mdb-select").materialSelect(); }); </script>

---