After some testing, Oddly My 70-200 f4 IS will work in bright light , but when I panned over to the shade, it stopped. Shame as thats the only lens I really wanted to work.
Siggy 50 Art works fine
Siggy NON art does not work
Canon 24-70mm II and 17-40mm does the same as the 70-200 f4. Works in bright light, but once you hit a shady area, it stops AF.
