diff --git a/mod/assign/db/upgrade.php b/mod/assign/db/upgrade.php
index 528ca095e50..a78cff41f61 100644
--- a/mod/assign/db/upgrade.php
+++ b/mod/assign/db/upgrade.php
@@ -93,5 +93,42 @@ function xmldb_assign_upgrade($oldversion) {
     // Automatically generated Moodle v4.0.0 release upgrade line.
     // Put any upgrade step following this.
 
+    if ($oldversion < 2022071300) {
+        // The most recent assign submission should always have latest = 1, we want to find all records where this is not the case.
+        // Find the records with the maximum timecreated for each assign and user combination where latest is also 0.
+        $sqluser = "SELECT s.id
+                      FROM {assign_submission} s
+                     WHERE s.timecreated = (
+                          SELECT  MAX(timecreated) timecreated
+                            FROM {assign_submission} sm
+                           WHERE s.assignment = sm.assignment
+                                 AND s.userid = sm.userid
+                                 AND sm.groupid = 0)
+                           AND s.groupid = 0
+                           AND s.latest = 0";
+        $idstofixuser = $DB->get_records_sql($sqluser, null);
+
+        $sqlgroup = "SELECT s.id
+                       FROM {assign_submission} s
+                      WHERE s.timecreated = (
+                          SELECT  MAX(timecreated) timecreated
+                            FROM {assign_submission} sm
+                           WHERE s.assignment = sm.assignment
+                                 AND s.groupid = sm.groupid
+                                 AND sm.groupid <> 0)
+                            AND s.groupid <> 0
+                            AND s.latest = 0";
+        $idstofixgroup = $DB->get_records_sql($sqlgroup, null);
+
+        $idstofix = array_merge(array_keys($idstofixuser), array_keys($idstofixgroup));
+
+        if (count($idstofix)) {
+            [$insql, $inparams] = $DB->get_in_or_equal($idstofix);
+            $DB->set_field_select('assign_submission', 'latest', 1, "id $insql", $inparams);
+        }
+
+        // Assignment savepoint reached.
+        upgrade_mod_savepoint(true, 2022071300, 'assign');
+    }
     return true;
 }
diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 286b6252321..b5eb7ce2b98 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -3168,12 +3168,14 @@ class assign {
                     $submission->latest = 1;
                 }
             }
+            $transaction = $DB->start_delegated_transaction();
             if ($submission->latest) {
                 // This is the case when we need to set latest to 0 for all the other attempts.
                 $DB->set_field('assign_submission', 'latest', 0, $params);
             }
             $submission->status = ASSIGN_SUBMISSION_STATUS_NEW;
             $sid = $DB->insert_record('assign_submission', $submission);
+            $transaction->allow_commit();
             return $DB->get_record('assign_submission', array('id' => $sid));
         }
         return false;
@@ -3950,11 +3952,13 @@ class assign {
                     $submission->latest = 1;
                 }
             }
+            $transaction = $DB->start_delegated_transaction();
             if ($submission->latest) {
                 // This is the case when we need to set latest to 0 for all the other attempts.
                 $DB->set_field('assign_submission', 'latest', 0, $params);
             }
             $sid = $DB->insert_record('assign_submission', $submission);
+            $transaction->allow_commit();
             return $DB->get_record('assign_submission', array('id' => $sid));
         }
         return false;
diff --git a/mod/assign/version.php b/mod/assign/version.php
index 7cd20de9f23..4a5c6b1ea22 100644
--- a/mod/assign/version.php
+++ b/mod/assign/version.php
@@ -25,5 +25,5 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'mod_assign'; // Full name of the plugin (used for diagnostics).
-$plugin->version  = 2022041900;    // The current module version (Date: YYYYMMDDXX).
+$plugin->version  = 2022071300;    // The current module version (Date: YYYYMMDDXX).
 $plugin->requires = 2022041200;    // Requires this Moodle version.