# Error calculating RegionDifference of two disk sectors

I am trying to implement an exercise that should be straightforward. I have two sectors of disks (in blue and orange below) with an overlap. I am trying to calculate their Region Difference, but it doesn't work! There is no subtraction! Is this a bug related to meshing and the curved geometry?

Code:

\[Phi]f = Pi/3;
Rf = 1.0;
sectorOrigin = {0, 0};
smallSector = Disk[sectorOrigin, Rf, {-\[Phi]f/2, \[Phi]f/2}];
minRadiusSector = Disk[sectorOrigin, Rf/2, {-\[Phi]f/2, \[Phi]f/2}];

Region[%]


• I did some tests and I believe the region is being calculated properly, but Region[] is not displaying it correctly. Any guesses as to why?