Split Isocurve sometimes removes face color

[spb (Steve)]

1. Create a _Box.
2. Set the color of one face.
3. _Explode the box.
4. _Split _Isocurve that face. PerFaceColor is lost.
5. _Undo the split.
6. _Split the face to a curve. PerFaceColor remains.
7. _Split _Isocurve either face from the split. PerFaceColor remains.

7.0.20168.13075, 6/16/2020

[theoutside (Kyle Houchens - McNeel and Assoc.)]

seeing same behavior here-

written up here- https://mcneel.myjetbrains.com/youtrack/issue/RH-59239

[brian (Brian Gillespie)]

RH-59239 is fixed in the latest WIP