I tried dragging out from an array of bools and ints to no avail. If I upgraded a project from 4.27 to 5.1.1 the loops would appear. I swapped to a different computer, installed 5.1.1, created a blank project and the same issue occurred.
After I pasted in the For Each node from a blueprint actor it now shows up fine.
Seems like it may be a bug.