Infernal Blade flame dash targeting is random with normal Ice nova but not transfigured Ice nova

This is not a bug. Triggered skills target where the trigger happens - for the case of triggers from using your skills, they target the same location as the skill you used that triggered them.

Ice Nova is a self-targeted skill, it always targets your own location (and a skill which requires a direction, such as a movement skill will pick a random direction if targeted at your own location. Ice Nova of Frostbolts targets a location near the cursor because it has to look for frostbolts in that area.