Not sure if anyone else has come across this in any other dungeons but the Skyshard in Softloam Cavern in Stonefalls can't be interacted with nor is glowing. I haven't collected it as it isn't highlighted in the achievements panel.
Gold Dragons Guildmaster PC-NACR2000+
Kalthar Wolf-Brother – EP Templar - 50 Maeli Valen - EP NB - 50Naps-During-Trials – EP Templar - 50Rulnakh - EP Sorc - 50Azrael Krieg - EP NB – 50Uvithasa Telvanni – EP DK – 50More-Tail - EP Warden - 50Narile Galen - EP Sorc - 50Bone Soldier - EP Necro - 50Naps-During-Trails - EP Necro - 50