handle propagate required

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release Notes for CKEditor for Craft CMS
 
+## Unreleased
+
+- Fixed a bug where CKEditor field values weren’t always getting propagated to other sites (with duplicated nested entries) when creating a new element. ([#479](https://github.com/craftcms/ckeditor/pull/479))
+
 ## 4.11.0 - 2025-11-19
 
 - Statically-rendered CKEditor fields are now shown in read-only mode. ([#466](https://github.com/craftcms/ckeditor/pull/466))

src/Field.php

@@ -372,6 +372,10 @@ private static function adjustFieldValues(
         }
 
         if ($resave) {
+            if (version_compare(Craft::$app->getVersion(), '5.9.0', '>=')) {
+                /** @phpstan-ignore-next-line */
+                $owner->propagateRequired = false;
+            }
             Craft::$app->getElements()->saveElement($owner, false, $propagate, false);
         }
     }
@@ -1904,4 +1908,20 @@ public function setEnableSourceEditingForNonAdmins(bool $value): void
     {
         $this->sourceEditingGroups = $value ? '*' : ['__ADMINS__'];
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function propagateValue(ElementInterface $from, ElementInterface $to): void
+    {
+        /** @phpstan-ignore-next-line */
+        parent::propagateValue($from, $to);
+
+        if (!$from->propagateAll) {
+            // NestedElementManager won't duplicate the nested entries automatically,
+            // because the field has a value in the target site (the HTML content), so isValueEmpty() is false.
+            /** @phpstan-ignore-next-line */
+            self::entryManager($this)->duplicateNestedElements($from, $to, force: true);
+        }
+    }
 }