Quinn Ult not cancelled by aoe damage

Quinn is not being taken out of her ult when she is damaged by aoe abilities. I noticed this several times during a match vs Quinn as Morgana where she would take damage from Tormented Soil, but not be pulled out of her ult. I posted on the boards, and people reported similar issues with MF's make it rain, and Singed's Poison so I imagine it happens with many over time aoe effects