With or without the shadow casting it still happens, I also have set everything to static.
It seems I was able to reduce the effect when adding back the ddx, ddy and setting a higher TAA step multiplier. And changing the AA mode to TAA but at other angles it still shows.
Also I’m not sure if I should still be splitting the input(multiply node) up for ddx and ddy or if it’s fine to pipe it in directly.