Fixed #18611

Author: brandonkelly

CHANGELOG.md

@@ -11,6 +11,7 @@
 - Fixed a bug where exceptions thrown when sending emails weren’t getting handled properly. ([#18597](https://github.com/craftcms/cms/issues/18597))
 - Fixed a bug where unordered lists weren’t getting styled correctly within Tip/Warning/Markdown field layout UI elements. ([#18598](https://github.com/craftcms/cms/issues/18598))
 - Fixed an error that could occur when upgrading to Craft 5. ([#18576](https://github.com/craftcms/cms/issues/18576))
+- Fixed a bug where nested Matrix entries’ Title fields were getting validation errors if blank, even if the nested entry was disabled. ([#18611](https://github.com/craftcms/cms/discussions/18611))
 
 ## 5.9.17 - 2026-03-17
 

src/fields/Matrix.php

@@ -1450,13 +1450,12 @@ private function validateEntries(ElementInterface $element): void
             $scenario = $element->getScenario();
 
             foreach ($entries as $entry) {
+                /** @var Entry $entry */
                 $entry->setOwner($element);
 
-                /** @var Entry $entry */
-                if (
-                    $scenario === Element::SCENARIO_ESSENTIALS ||
-                    ($entry->enabled && $scenario === Element::SCENARIO_LIVE)
-                ) {
+                if (!$entry->enabled) {
+                    $entry->setScenario(Element::SCENARIO_ESSENTIALS);
+                } else {
                     $entry->setScenario($scenario);
                 }