Merge pull request #16136 from craftcms/bugfix/nested-entries-and-own…

…ers-new-site

Editing owner entry when it's new for site (and still a provisional draft)

src/base/NestedElementTrait.php

@@ -154,8 +154,9 @@ public function getPrimaryOwner(): ?ElementInterface
                 return null;
             }
 
-            $this->_primaryOwner = Craft::$app->getElements()->getElementById($primaryOwnerId, null, $this->siteId, [
+            $this->_primaryOwner = Craft::$app->getElements()->getElementById($primaryOwnerId, null, null, [
                 'trashed' => null,
+                'preferSites' => [$this->siteId],
             ]) ?? false;
             if (!$this->_primaryOwner) {
                 throw new InvalidConfigException("Invalid owner ID: $primaryOwnerId");