Aw! Just found the bug. it's a very small bug, but can't fix it for a month.
And Sandy+Korra scene should be in tree of time, if it was unlocked in game. Click the 3rd image in 4th page of Korra.
Viewing post in Book 5 Untold v1.0 [Completed] (Free) comments
Really Thanks, man :) I have added codes to fix these two issues in my files. But I can't export the game to mobile now. I had no intention of updating Book 5. But after your interest, I can't let this go :) I am running on deadline for XIX. So If you are willing to wait, I can update Book 5 in a month.