Old bugs hang up Rhino 6

MoveUntrimmedEdge command and MoveUntrimmedFace command hang up Rhino 6 when they are used on extrusion objects.

The same bugs are in Rhino 6.3.

Fixed in 6.4:

MoveUntrimmedFace is not supported on Extrusion objects.
It reports:
Command: MoveUntrimmedFace
Select a face from untrimmed polysurface ( Copy=No )
Secelect face is from extrusion. Need to convert to Brep before selecting the face.