I've checked about the forum & bug tracker & did not come across this specific query
When the spell "presence of mind" is cast the buff states "your next Mage spell with a casting time of less than 10 sec will be an instant cast spell" although it works for the likes of frostbolt etc I've noticed that the teleport & portal spells have a cast time of 9.23 sec for me & is not reduced to instant under the presence of mind spell effect, portal & teleport are after all Mage spells & I was wondering if this is a bug or working as intended?