Index: trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/class-upload-handler.php
===================================================================
--- trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/class-upload-handler.php	(revision 11257)
+++ trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/class-upload-handler.php	(working copy)
@@ -417,6 +417,11 @@
 			'wp-media-folder',
 			'wp-file-download',
 			'wp-table-manager',
+			// reserved plugins that used to exist outside of .org -- reusing would be bad.
+			'acf-repeater',
+			'acf-flexible-content',
+			'acf-options-page',
+			'acf-gallery',
 		);
 
 		return in_array( $this->plugin_slug, $reserved_slugs );