diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01d61ed..cd60111 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## Unresolved
+### Fixed
+- Course index disappears for students if there are sections with access restrictions #89
+
 ## [4.1.0] - 2024-05-22
 ### Added
 - Support for Moodle 4.4, #83
diff --git a/lib.php b/lib.php
index 3546a3c..7df904f 100644
--- a/lib.php
+++ b/lib.php
@@ -196,7 +196,7 @@ public function get_view_url($section, $options = []) {
 
         $sectionno = $this->resolve_section_number($section);
         $section = $this->get_section($sectionno);
-        if ($sectionno && (!$section->uservisible || !$this->is_section_real_available($section))) {
+        if ($sectionno && !$this->is_section_visible($section)) {
             return empty($options['navigation']) ? $url : null;
         }
 
diff --git a/tests/behat/section_restriction.feature b/tests/behat/section_restriction.feature
new file mode 100644
index 0000000..b8d04db
--- /dev/null
+++ b/tests/behat/section_restriction.feature
@@ -0,0 +1,95 @@
+@format @format_flexsections @javascript
+Feature: Testing section restrictions in format_flexsections
+
+  Background:
+    Given the following "users" exist:
+      | username | firstname | lastname | email                |
+      | student1 | Sam       | Student  | student1@example.com |
+      | student2 | Mary      | Student  | student2@example.com |
+      | teacher1 | Terry     | Teacher  | teacher1@example.com |
+    And the following config values are set as admin:
+      | maxsectiondepth | 4 | format_flexsections |
+    And the following "courses" exist:
+      | fullname | shortname | format       | numsections | enablecompletion |
+      | Course 1 | C1        | flexsections | 3           | 1                |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | student1 | C1     | student        |
+      | student2 | C1     | student        |
+      | teacher1 | C1     | editingteacher |
+    And the following "activities" exist:
+      | activity | course | idnumber | intro | name          | section | completion |
+      | assign   | C1     | a1       | x     | First module  | 1       | 1          |
+      | forum    | C1     | a2       | x     | Second module | 2       |            |
+    And I log in as "teacher1"
+    And I am on "Course 1" course homepage with editing mode on
+    And I open section "2" edit menu
+    And I click on "Move" "link" in the "#section-2 .action-menu" "css_element"
+    And I click on "As a subsection of 'Topic 1'" "link" in the "Move section" "dialogue"
+    And I open section "3" edit menu
+    And I click on "Add subsection" "link" in the "li#section-3" "css_element"
+
+  Scenario: Restricting section in flexsections format displays this section as not available
+    And I edit the section "1"
+    And I expand all fieldsets
+    And I click on "Add restriction..." "button" in the "root" "core_availability > Availability Button Area"
+    And I click on "Date" "button" in the "Add restriction..." "dialogue"
+    And I set the field "year" in the "1" "availability_date > Date Restriction" to "2023"
+    And I set the field "Direction" in the "1" "availability_date > Date Restriction" to "until"
+    And I press "Save changes"
+    And I click on "Open course index" "button"
+    And I should see "Topic 1" in the "courseindex-content" "region"
+    And I should see "First module" in the "courseindex-content" "region"
+    And I should see "Topic 2" in the "courseindex-content" "region"
+    And I should see "Second module" in the "courseindex-content" "region"
+    And I should see "Topic 3" in the "courseindex-content" "region"
+    And I should see "Topic 4" in the "courseindex-content" "region"
+    And I log out
+    And I change window size to "large"
+    And I log in as "student1"
+    And I am on "Course 1" course homepage
+    And I should see "Topic 1" in the "courseindex-content" "region"
+    And I should not see "First module" in the "courseindex-content" "region"
+    # And I should not see "Topic 2" in the "courseindex-content" "region"
+    # And I should not see "Second module" in the "courseindex-content" "region"
+    And I should see "Topic 3" in the "courseindex-content" "region"
+    And I should see "Topic 4" in the "courseindex-content" "region"
+    And I should see "Topic 1" in the "region-main" "region"
+    And I should not see "First module" in the "region-main" "region"
+    # And I should not see "Topic 2" in the "region-main" "region"
+    # And I should not see "Second module" in the "region-main" "region"
+    And I should see "Topic 3" in the "region-main" "region"
+    And I should see "Topic 4" in the "region-main" "region"
+
+  Scenario: Restricting and hiding section in flexsections format hides this section from students
+    And I edit the section "1"
+    And I expand all fieldsets
+    And I click on "Add restriction..." "button" in the "root" "core_availability > Availability Button Area"
+    And I click on "Date" "button" in the "Add restriction..." "dialogue"
+    And I set the field "year" in the "1" "availability_date > Date Restriction" to "2023"
+    And I set the field "Direction" in the "1" "availability_date > Date Restriction" to "until"
+    And I click on ".availability-item .availability-eye img" "css_element"
+    And I press "Save changes"
+    And I click on "Open course index" "button"
+    And I should see "Topic 1" in the "courseindex-content" "region"
+    And I should see "First module" in the "courseindex-content" "region"
+    And I should see "Topic 2" in the "courseindex-content" "region"
+    And I should see "Second module" in the "courseindex-content" "region"
+    And I should see "Topic 3" in the "courseindex-content" "region"
+    And I should see "Topic 4" in the "courseindex-content" "region"
+    And I log out
+    And I change window size to "large"
+    And I log in as "student1"
+    And I am on "Course 1" course homepage
+    And I should not see "Topic 1" in the "courseindex-content" "region"
+    And I should not see "First module" in the "courseindex-content" "region"
+    And I should not see "Topic 2" in the "courseindex-content" "region"
+    And I should not see "Second module" in the "courseindex-content" "region"
+    And I should see "Topic 3" in the "courseindex-content" "region"
+    And I should see "Topic 4" in the "courseindex-content" "region"
+    And I should not see "Topic 1" in the "region-main" "region"
+    And I should not see "First module" in the "region-main" "region"
+    And I should not see "Topic 2" in the "region-main" "region"
+    And I should not see "Second module" in the "region-main" "region"
+    And I should see "Topic 3" in the "region-main" "region"
+    And I should see "Topic 4" in the "region-main" "region"