Hi, I saw the fox tail / heat stress conversation and just have to throw something in. BTW, that stressed Thai pic by Woodsman is a doozy alright. Look at the severe heat stress on the surrounding leaves... Looks like one of my grows! Lol.
I had the fresh hairs coming out on my heat stressed buds on my last grow. It was late, late into flowering, but the buds that were getting hit hardest by the heat started developing new bud growth with fresh white hairs when the rest of the plant had all dry hairs and the buds were very mature. I flushed a little early too because I didn't see a point in letting them ride it out any longer with that massive heat stress. So yeah, I got the new bud growth in late bloom just like you're getting. In addition to an early flush, I do believe it is also the plant's way of trying to protect the burning buds too close to the light by channeling massive N-driven chlorophyll to them... resulting in new growth that looks like stuff from weeks and weeks ago.