Ticket #31327: 31327.patch

src/wp-admin/includes/ajax-actions.php

@@ -2904 +2904 @@
         }
 
         $plugin_status = install_plugin_install_status( $api );
-        activate_plugin( $plugin_status['file'] );
 
+        if ( ! is_multisite() ) {
+                activate_plugin( $plugin_status['file'] );
+        }
+
         wp_send_json_success( $status );
 }