Thanks for letting me know @clement
Truth is I have too much to learn with Python.
And I am in a prototyping stage so it is not fatal. I don’t save my files. It was just very weird when I found this bug.
The fact that it is scheduled for Rhino7 is troublesome. This is not a new Rhino7 function. This is clearly a bug. As such it has to be fixed in Rhino6 release lifetime.