What you were expecting to happen, and what actually happened?
Great Maw uses its spell when entangled.
1st, I thought Attack buff will break entangle? Or did that rule rescinded?
Even so, after devour, Great Maw recieves the appropriate Armor and Health buff, but when the Entangle effect wears off, its Attack remains at original value (without devour bonus)
What are the steps to make it happen again?
get Maw entanged
wait for entangle to wear off
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
Actually it’s the other way around. It used to work like now originally, not getting attack buffs when entangled, then they ‘fixed’ it, with the weird side effect of attack buffs canceling entangle. All they did now was revert the fix, because it made entangle too weak.