I have a Samsung Galaxy Tab 4 7.0 SM-T231; when opening the worlds the game crashes shortly after. Just go to options and the servers tab and play with those, then open the worlds and you can play the worlds in 5 minutes or something like that, then sometimes the game crashes and you lose the work you did in the session when the game crashed.
This bug must be fixed as it also happens on my Samsung Galaxy Tab 4 7.0 🙂
For me I also use a text editor outside Minecraft to set it to 46 chunks (usually) and any number, if ever I want to... Also ends up being 8 chunks...