Extrusion(?) issue on round surfaces

See image - Why is this extrusion situation happening? Left was printed with tree supports (prusaslicer). Right was printed without supports. I thought this was one of many issues due to bimetal effect. I upgraded the x-axis with titanium tube, and the problem persists despite the other known issues to have pretty much resolved. 45 degree overhang Mostly stock settings on V-Core 4, except I increased retraction to 1mm for this print to see if the results changed. They did not; this looks the same as when I left the retraction at 0.5mm default.