2.79 - 2.80 "Add copied F-Modifiers to the selected F-Curves" only copies to one curve

Hi guys, is this a known issue. Was going to report as a bug, but perhaps I’ve misunderstood something!

So not sure if the error is that copying and pasting a modifier from one curve to multiple curves is broken. Or if the description is misleading?
Naturally, being able to paste a modifier to all selected curves would be very handy.

Add say rotation keys with obvious changes in angle at frame 1, 10 and 20.
Select one curve and add a cycle modifier.
Copy the modifier
Select the other two curves and paste the modifier
For me, only one curve receives the modifier.