For some reason the pool\ water park level is all backwards now. You start at the lazy river, then go through the water park and then end up back at the pools. When you get to this part, you come downstairs and you follow the wire and it's the same place as v2 had it but now the box is missing. You do the puzzle and finish it, and it locks the door you entered from and never opens any other door for you. Leaving you effectively trapped. 

Any clue of how to fix this? was this game not tested?

You need to download the update. This was fixed in the build yesterday.
Also, try looking at the other threads before making a thread about something that's already had a dozen threads made on it and is also in the stickied post at the top.

there wasn't an update out when I posted this, nor was there a thread about it lol.