MSAA issues between triangles

I know MSAA is not perfect but in URP (forward) I see what looks like background pixels appearing where 2 polygons meet. See image below. Seems like the poly behind is appearing in a few pixels as if a gap is opening between the convex edge of 2 polygons. It is not visible without MSAA on the left but appears with 4x or 8x

image

Is there any reference for expected MSAA anomalies?