Hmmm. I'll take your point. Maybe the game is coded for tags to work only on the Humanoid.gla. Maybe its not programmed to recognise tags with any others.
Anakin: "Don't worry master. It would take a human sized orange tanned fish with floppy ears and a racially questionable accent to make ME turn to the dark side!"
Obi-Wan: "Where's Jar Jar"