Only dealt with small free pieces with 50-75% burl wrap....bigger pieces still have bark inclusions even in 360 degree 14-16" ball burls in White oak?
NOT all burls are perfect smooth spheres!
Oh...last piece was cut with a Whiteside 1.25" Mortising bit at 3,1,16K up to .1" pass depth...bark inclusions stayed PUT.
Same settings for most rough cuts on the 2 pieces until I got to where I wanted, then a .02" pass depth same settings for final pass.