diff --git a/analytics/classes/analysis.php b/analytics/classes/analysis.php
index 270a9f63a79..25d926a1698 100644
--- a/analytics/classes/analysis.php
+++ b/analytics/classes/analysis.php
@@ -216,6 +216,7 @@ class analysis {
 
         $result = new \stdClass();
 
+        $timesplitting->set_modelid($this->analyser->get_modelid());
         if (!$timesplitting->is_valid_analysable($analysable)) {
             $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
             $result->message = get_string('invalidanalysablefortimesplitting', 'analytics',
diff --git a/analytics/classes/local/time_splitting/base.php b/analytics/classes/local/time_splitting/base.php
index 00884ed34e0..7150e21243b 100644
--- a/analytics/classes/local/time_splitting/base.php
+++ b/analytics/classes/local/time_splitting/base.php
@@ -100,6 +100,15 @@ abstract class base {
         $this->validate_ranges();
     }
 
+    /**
+     * Assigns the model id to this time-splitting method it case it needs it.
+     *
+     * @param int $modelid
+     */
+    public function set_modelid(int $modelid) {
+        $this->modelid = $modelid;
+    }
+
     /**
      * get_analysable
      *
diff --git a/analytics/classes/model.php b/analytics/classes/model.php
index ced29b272a0..d83c733d80a 100644
--- a/analytics/classes/model.php
+++ b/analytics/classes/model.php
@@ -1014,6 +1014,7 @@ class model {
 
                 // Append new elements (we can not get duplicates because sample-analysable relation is N-1).
                 $timesplitting = $this->get_time_splitting();
+                $timesplitting->set_modelid($this->get_id());
                 $timesplitting->set_analysable($data->analysable);
                 $range = $timesplitting->get_range_by_index($rangeindex);
 
@@ -1076,6 +1077,7 @@ class model {
 
         $analysable = $this->get_analyser()->get_sample_analysable($sampleid);
         $timesplitting = $this->get_time_splitting();
+        $timesplitting->set_modelid($this->get_id());
         $timesplitting->set_analysable($analysable);
         $range = $timesplitting->get_range_by_index($rangeindex);
         if ($range) {
diff --git a/analytics/tests/analysis_test.php b/analytics/tests/analysis_test.php
index 9d763cd6b18..ca92bb991dc 100644
--- a/analytics/tests/analysis_test.php
+++ b/analytics/tests/analysis_test.php
@@ -24,6 +24,8 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+require_once(__DIR__ . '/../../analytics/tests/fixtures/test_timesplitting_upcoming_seconds.php');
+
 /**
  * Unit tests for the analysis class.
  *
@@ -40,20 +42,45 @@ class analytics_analysis_testcase extends advanced_testcase {
     public function test_fill_firstanalyses_cache() {
         $this->resetAfterTest();
 
-        $this->insert_used(1, 1, 'training', 123);
-        $this->insert_used(1, 2, 'training', 124);
-        $this->insert_used(1, 1, 'prediction', 125);
+        $modelid = 1;
 
-        $firstanalyses = \core_analytics\analysis::fill_firstanalyses_cache(1);
+        $params = ['startdate' => (new DateTimeImmutable('-5 seconds'))->getTimestamp()];
+        $course1 = $this->getDataGenerator()->create_course($params);
+        $course2 = $this->getDataGenerator()->create_course($params);
+        $analysable1 = new \core_analytics\course($course1);
+
+        $afewsecsago = time() - 5;
+        $earliest = $afewsecsago - 1;
+
+        $this->insert_used($modelid, $course1->id, 'training', $afewsecsago);
+
+        // Course2 processed after course1.
+        $this->insert_used($modelid, $course2->id, 'training', $afewsecsago + 1);
+
+        // After the first process involving course1.
+        $this->insert_used($modelid, $course1->id, 'prediction', $afewsecsago + 5);
+
+        $firstanalyses = \core_analytics\analysis::fill_firstanalyses_cache($modelid);
         $this->assertCount(2, $firstanalyses);
-        $this->assertEquals(123, $firstanalyses['1_1']);
-        $this->assertEquals(124, $firstanalyses['1_2']);
+        $this->assertEquals($afewsecsago, $firstanalyses[$modelid . '_' . $course1->id]);
+        $this->assertEquals($afewsecsago + 1, $firstanalyses[$modelid . '_' . $course2->id]);
 
         // The cached elements gets refreshed.
-        $this->insert_used(1, 1, 'prediction', 122);
-        $firstanalyses = \core_analytics\analysis::fill_firstanalyses_cache(1, 1);
+        $this->insert_used($modelid, $course1->id, 'prediction', $earliest);
+        $firstanalyses = \core_analytics\analysis::fill_firstanalyses_cache($modelid, $course1->id);
         $this->assertCount(1, $firstanalyses);
-        $this->assertEquals(122, $firstanalyses['1_1']);
+        $this->assertEquals($earliest, $firstanalyses[$modelid . '_' . $course1->id]);
+
+        // Upcoming periodic time-splitting methods can read and process the cached data.
+        $seconds = new test_timesplitting_upcoming_seconds();
+        $seconds->set_modelid($modelid);
+        $seconds->set_analysable($analysable1);
+
+        // The generated ranges should start from the cached firstanalysis value, which is $earliest.
+        $ranges = $seconds->get_all_ranges();
+        $this->assertCount(7, $ranges);
+        $firstrange = reset($ranges);
+        $this->assertEquals($earliest, $firstrange['time']);
     }
 
     private function insert_used($modelid, $analysableid, $action, $timestamp) {