That may look like a minor annoyance but this is really annoying.
Please, have a look:
Selected point (beginning of the centerpoint arc) intersects with angular construction line (gray dashed line) and... with a circle of 1.47 cm diameter (blue dashed lline) centered at the system origin.
For whatever reason SW draws some circles a bit smaller than they are, while snaps are active at proper locations. Please, have a look at thee two tangent circles:
You may see the big circle (1.47 cm diameter) is drawned left of 1.47 cm vertical grid line, but its snap point (tangent relation) is exactly at the expected location !
Can you confirm ?