Yes, I am seeing this in my testing. It is for a project.
We mostly run thermomechanically treated bars (Tempcore process) that are A615 grade. They show the typical discontinuous yielding of plain carbon steel. The A706 grade is a low alloy steel predominately strengthened by the addition of manganese and vanadium. I have not found literature on this effect. Could the alloying condition result in a greater degree of continuous yielding rather than discontinuous?
Also, testing conditions are the same for both types of bars.