diff --git a/lib/classes/cron.php b/lib/classes/cron.php
index 0b941cfce7e..6f2d6fb4cd6 100644
--- a/lib/classes/cron.php
+++ b/lib/classes/cron.php
@@ -382,6 +382,8 @@ class cron {
     public static function run_inner_scheduled_task(\core\task\task_base $task) {
         global $CFG, $DB;
         $debuglevel = $CFG->debug;
+        $debugdisplay = $CFG->debugdisplay;
+        $CFG->debugdisplay = 1;
 
         \core\task\manager::scheduled_task_starting($task);
         \core\task\logmanager::start_logging($task);
@@ -403,7 +405,7 @@ class cron {
             // Temporarily increase debug level if task has failed and debugging isn't already at maximum.
             if ($debuglevel !== DEBUG_DEVELOPER && $faildelay = $task->get_fail_delay()) {
                 mtrace('Debugging increased temporarily due to faildelay of ' . $faildelay);
-                set_debugging(DEBUG_DEVELOPER);
+                set_debugging(DEBUG_DEVELOPER, 1);
             }
             $task->execute();
             if ($DB->is_transaction_started()) {
@@ -439,6 +441,10 @@ class cron {
             if ($CFG->debug !== $debuglevel) {
                 set_debugging($debuglevel);
             }
+
+            // Reset debugdisplay back.
+            $CFG->debugdisplay = $debugdisplay;
+
             // Reset back to the standard admin user.
             self::setup_user();
             self::set_process_title('Waiting for next scheduled task');
@@ -455,6 +461,8 @@ class cron {
     public static function run_inner_adhoc_task(\core\task\adhoc_task $task) {
         global $CFG, $DB;
         $debuglevel = $CFG->debug;
+        $debugdisplay = $CFG->debugdisplay;
+        $CFG->debugdisplay = 1;
 
         \core\task\manager::adhoc_task_starting($task);
         \core\task\logmanager::start_logging($task);
@@ -506,7 +514,7 @@ class cron {
             // Temporarily increase debug level if task has failed and debugging isn't already at maximum.
             if ($debuglevel !== DEBUG_DEVELOPER && $faildelay = $task->get_fail_delay()) {
                 mtrace('Debugging increased temporarily due to faildelay of ' . $faildelay);
-                set_debugging(DEBUG_DEVELOPER);
+                set_debugging(DEBUG_DEVELOPER, 1);
             }
             $task->execute();
             if ($DB->is_transaction_started()) {
@@ -542,6 +550,10 @@ class cron {
             if ($CFG->debug !== $debuglevel) {
                 set_debugging($debuglevel);
             }
+
+            // Reset debugdisplay back.
+            $CFG->debugdisplay = $debugdisplay;
+
             // Reset back to the standard admin user.
             self::setup_user();
             self::prepare_core_renderer(true);