Looks like the new pets are not working with the beastmastery Blind and Weakness on F2 Traits (Go for the Eyes and Wilting Strike).
Only tested with Smokescale, Tiger and Bristleback. None of them worked with the traits.
Old Pets are working fine.
EDIT: Not only those traits are not working, the tooltip for the new pets F2 skill doesn’t show the weakness and blind effect you should get.
Old pets show these effects as intended.