Sorry, my bad. No bug at all. Only in my command, which used a vector (which meant two points without xx coordinates in this case) as input when it should have used a matrix.
This works as expected
plot([315 30], marker=:circ, mc=:green, ms=0.2, region=:global,
proj=(name=:Stereographic, center=(0,0)),
frame=(annot=:auto, grid=:auto), show=true, coast=true)