Since the Update, ground based snares affect Roll Dodge distance where previously they did not. When an enemy places an ice ring, for example, you can no longer Roll Dodge out of the ring to escape it near instantly. Considering the recovery time and resource expenditure, it is better to move out of snares than Roll Dodge in the present version of ESO. This is the troll special "L2P issue" -- all players are having difficulty adjusting to the new mechanics. Give it time (experience, really) and players will adapt to this new feature.
It cannot hurt to /bug this mechanic either, as it may indeed by an oversight in the code.
Until proven as unintended, assume it is WAI and work with it.