I don't think the grace period is back. I came in after breakfast (Asia timezone), it came with 0.2 bar no dot, red spots on wings, tail and chin. Hit it till 0.15. Next round, he came with 0.15 bar, more red dots on face, neck, front legs (I didn't do those to him, those were already charred in my 1st round). Knock him down to like 0.025, he flew away.
I thot sh!t, I missed it. Next round, he came with 0.01 and lots of red dots, but not as many as the previous grace period dead Ur dragon. And these red dot don't go down as easily as the former grace period ones. It felt more like I am solo'ing him during a grace period, rather than the good old zero hp ones that die for good in 30 seconds.