Index: core/kernel/utility/unit_config_reader.php
===================================================================
--- core/kernel/utility/unit_config_reader.php
+++ core/kernel/utility/unit_config_reader.php
@@ -799,9 +799,8 @@
 		$file = $this->prefixFiles[$prefix];
 		$prefix = $this->PreloadConfigFile($file);
 
-		if ($this->FinalStage) {
-			// run prefix OnAfterConfigRead so all
-			// hooks to it can define their clonses
+		if ( $this->FinalStage || $prefix == 'm' ) {
+			// Run prefix OnAfterConfigRead so all hooks to it can define their clones.
 			$this->runAfterConfigRead($prefix);
 		}
 
@@ -1016,4 +1015,4 @@
 		}
 	}
 
-}
\ No newline at end of file
+}