Template Crashes

I couldn't find my Minecraft version on there so I had to select the closest resembling one unfortunately. I have been playing Minecraft PE for years, before the release of the pre-made worlds and when they first came out I bought some, I've spent a total of probably 30 dollars so far on these worlds and I have noticed that they have been crashing. I know this doesn't affect every player but it has affected me and people I know, the worlds with play for around 45 seconds and then crash, I think this bug should really get fixed because everyone who spent money on these basically wasted their money. I don't know much about bugs but I think this is a very irritating bug and I'd like to know if others are experiencing this