Bug: Thumbnails created in wrong directory

I tried to change the 'name' parameter for my images ResourceType to another value ("Bilder", the norwegian for "images"), while keeping the old directory structure.

$config['ResourceType'][] = Array(
      'name' => 'Bilder',
      'url' => $baseUrl . 'images',
      'directory' => $baseDir . 'images',
      …

This setup leads to images being uploaded correctly to "images/...", but thumbs are created in "_thumbs/Bilder/...". This seems very inconsistent to me, and causes problems for my application, so I have to switch back until this bug is fixed.