diff --git a/.upgradenotes/MDL-83008-2024090514122136.yml b/.upgradenotes/MDL-83008-2024090514122136.yml
new file mode 100644
index 00000000000..1ee3ea3372b
--- /dev/null
+++ b/.upgradenotes/MDL-83008-2024090514122136.yml
@@ -0,0 +1,8 @@
+issueNumber: MDL-83008
+notes:
+  core_completion:
+    - message: >
+        A new FEATURE_COMPLETION plugin support constant has been added. In the
+        future, this constant will be used to indicate when a plugin does not
+        allow completion and it is enabled by default.
+      type: improved
diff --git a/completion/classes/manager.php b/completion/classes/manager.php
index f77a543d0f3..bb71b3cd4df 100644
--- a/completion/classes/manager.php
+++ b/completion/classes/manager.php
@@ -276,6 +276,9 @@ class manager {
      */
     public static function can_edit_bulk_completion($courseorid, $cm = null) {
         if ($cm) {
+            if (!plugin_supports('mod', $cm->modname, FEATURE_COMPLETION, true)) {
+                return false;
+            }
             return $cm->uservisible && has_capability('moodle/course:manageactivities', $cm->context);
         }
         $coursecontext = context_course::instance(is_object($courseorid) ? $courseorid->id : $courseorid);
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index e55c6adbab2..24074c9a062 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -425,6 +425,8 @@ define('FEATURE_CONTROLS_GRADE_VISIBILITY', 'controlsgradevisbility');
 /** True if module supports plagiarism plugins */
 define('FEATURE_PLAGIARISM', 'plagiarism');
 
+/** True if module supports completion (true by default) */
+define('FEATURE_COMPLETION', 'completion_enabled');
 /** True if module has code to track whether somebody viewed it */
 define('FEATURE_COMPLETION_TRACKS_VIEWS', 'completion_tracks_views');
 /** True if module has custom completion rules */
diff --git a/mod/subsection/lib.php b/mod/subsection/lib.php
index 9c91b035184..ef0fbf162a0 100644
--- a/mod/subsection/lib.php
+++ b/mod/subsection/lib.php
@@ -37,6 +37,7 @@ function subsection_supports($feature) {
         FEATURE_GROUPS => false,
         FEATURE_GROUPINGS => false,
         FEATURE_MOD_INTRO => false,
+        FEATURE_COMPLETION => false,
         FEATURE_COMPLETION_TRACKS_VIEWS => false,
         FEATURE_GRADE_HAS_GRADE => false,
         FEATURE_GRADE_OUTCOMES => false,
diff --git a/mod/subsection/tests/behat/subsection_no_completion.feature b/mod/subsection/tests/behat/subsection_no_completion.feature
index d0efef7dcb8..d8a926f7195 100644
--- a/mod/subsection/tests/behat/subsection_no_completion.feature
+++ b/mod/subsection/tests/behat/subsection_no_completion.feature
@@ -16,9 +16,10 @@ Feature: Subsection does not have completion.
       | user      | course  | role            |
       | teacher1  | C1      | editingteacher  |
     And the following "activities" exist:
-      | activity   | name                 | course | idnumber     | section |
-      | subsection | Subsection 1         | C1     | subsection1  | 1       |
-      | page       | Page in Subsection 1 | C1     | page1        | 2       |
+      | activity   | name               | course | idnumber     | section |
+      | wiki       | Wiki activity      | C1     | subsection1  | 1       |
+      | subsection | Subsection 1       | C1     | subsection1  | 1       |
+      | page       | Page in Subsection | C1     | page1        | 2       |
 
   Scenario: Subsection does not appear in the site default completion form
     Given I log in as "admin"
@@ -35,3 +36,15 @@ Feature: Subsection does not have completion.
     And I should see "Default activity completion"
     Then I should see "Forum" in the "region-main" "region"
     And I should not see "Subsection" in the "region-main" "region"
+
+  @javascript
+  Scenario: Subsection completion should not be editable in the completion bulk edit
+    Given I am on the "C1" "Course" page logged in as "teacher1"
+    When I navigate to "Course completion" in current page administration
+    And I set the field "Course completion tertiary navigation" to "Bulk edit activity completion"
+    And I should see "Bulk edit activity completion"
+    Then I should see "Wiki activity" in the "region-main" "region"
+    Then I should see "Page in Subsection" in the "region-main" "region"
+    # It appears as a subsection but not as an editable element.
+    Then I should see "Subsection 1" in the "region-main" "region"
+    And "Subsection 1" "link" in the "region-main" "region" should not be visible