(WGS84, Pseudo-Mercator) I buffer a point with 5000m and when I mesure it (because it does not cover the area expected) it gets a circle with about 4,500m. I have validated the map registers well point coordinates – I copy a point from other map and it gets correctly pasted in map.
Adobe released an update to Illustrator 2021 (v25.3) that includes native support for M1 Devices and Rotate Artboard functionality. Please note these features are not yet supported within MAPublisher at this time. See compatibility notes.