not quiet certain what you mean, or how it is a bug, are you asking for enable/disable helm to work when not just at the tower?
able to make a screen shot to help explain?
English
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Heres an example Glowing red tube in exo character customization screen: http://www.google.com/imgres?imgurl=http://oyster.ignimgs.com/mediawiki/apis.ign.com/destiny/thumb/2/2b/ExoFemale.jpg/228px-ExoFemale.jpg&imgrefurl=http://www.ign.com/wikis/destiny/Character_Creation&h=231&w=228&tbnid=aENQRpyYoXEE7M:&zoom=1&docid=gqaZJSc0lzeqgM&ei=w3VMVdmZHsPisAX2z4CoAg&tbm=isch&ved=0CGsQMygyMDI Player screen cap of ingame exo face without any tubes for the given head/face chosen when customizing characters: http://www.google.com/imgres?imgurl=http://fc04.deviantart.net/fs71/i/2014/207/e/4/destiny_exo_by_xxxshadowsneakxxx-d7sfs6a.jpg&imgrefurl=http://xxxshadowsneakxxx.deviantart.com/art/Destiny-Exo-471028834&h=576&w=1024&tbnid=DHnZhgSlBtPWiM:&zoom=1&docid=NKmkaLn_UQx5MM&ei=u3VMVe_LHIHEsAWIt4DICg&tbm=isch&ved=0CB4QMygBMAE Now i may be wrong but there may be a setting when making a character to disable the glowing tubes or to make them black, but IIRC these tubes should be visable in some way when you are say in the tower during vanilla and now as long as the player has their helmet armor off in settings.
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glowing tubes are in the mouth?
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almost always if im not mistaken, but i believe one face/head may have them somewhere else as well as in the mouth, my no eyes face is filled with these in the giant mouth gaps but i can just see a giant whole through the side of my face if im in the tower and it looks pretty bad