Was in a battlegrounds match tonight and my Ziliax minion lost windfury despite saying it had windfury. Details below.
I was Elise Starseeker. I had the ziliax component with windfury, but it had not been made golden with other ziliaxes. It had been magnetized with the growing 2/2 mech and I believe the 2/4 divine shield mech. I used the spell that makes a minion golden on the ziliax and it turned the minion golden, changing the icon to a combined Ziliax, listing only windfury as its text. However, the unit would no longer attack with windfury, only attacking once at a time like a normal minion.