So, I know I'm not the only one who was unable to get onto Ukaizo Harbor. There is a way to teleport to Ukaizo Harbor. You will not get whatever scene was supposed to play before going to Ukaizo, but you will be able to finish the game.
Press "`~" to enter the console
Type "iRoll20s" (this will enable cheats and disable future achievements)
With the console closed, hit F11. This will open a list of all the map locations. There is a search bar, so type in Ukaizo, and you'll see the location of Ukaizo Harbor. Click on it, then click "go." You should teleport to Ukaizo Harbor and begin the fight with the guardian. You can then proceed to the end of the game.
I hope this helps someone, and I hope there's a solution soon that doesn't involve cheating...but I just wanted to finish the dang game!
