I have a crash in a world since the update aquatic, and I think it comes from water problems after all. The one biggest change in update aquatic is the property of water blocks. I found that the crashing maybe due to some glitched water blocks (maybe from older versions).

Here is the map where I encountered crashing when I go to some particular areas in the map.
https://drive.google.com/drive/folders/0B6UY8ZW2V18SaDVFV2wyaHVtdE0