case for case sensitive metadata grav-admin-plugin#1370

CHANGELOG.md

@@ -9,6 +9,7 @@
     * Improved Zip extraction error codes [#1922](https://github.com/getgrav/grav/issues/1922)  
 1. [](#bugfix)
     * Fix an issue with Markdown Video and Audio that broke after Parsedown 1.7.0 Security updates [#1924](https://github.com/getgrav/grav/issues/1924)
+    * Fixx for case-sensitive page metadata [admin#1370](https://github.com/getgrav/grav-plugin-admin/issues/1370)
 
 
 # v1.4.1

system/src/Grav/Common/Page/Page.php

@@ -1499,6 +1499,8 @@ class Page
 
             // Build an array of meta objects..
             foreach ((array)$metadata as $key => $value) {
+                // Lowercase the key
+                $key = strtolower($key);
                 // If this is a property type metadata: "og", "twitter", "facebook" etc
                 // Backward compatibility for nested arrays in metas
                 if (is_array($value)) {