Rhino 6 bug - FilletEdge

The following screenshot illustrates the FilletEdge bug.

Solid before FilletEdge command: before filletedge.3dm (171.1 KB)

Solid after FilletEdge command: after filletedge.3dm (208.6 KB)

Hello - I cannot, so far, reproduce that blue surface - did that appear, or was it a surface that existed and was associatted with the cone via History, or?

-Pascal

History was turned off. The bug appeared when I was making the fillet. It is possible that I initially set too big radius of the fillet and I reduced it before I finished the FilletEdge command.