I have a World I started in Minecraft Beta in windows 10 that worked up to v1.4.2
The world would crash (and all past saves as well) when I tried to load it in v1.13.1
The world worked when I loaded it a few weeks ago.
The World keeps crashing with v1.14.1 after the update.
It is a 147.1MB Creative world.
I have fixed this problem by using the Universal Minecraft Converter. It was the way the world game was saved from the past updates that messed it up. By using the UMC to convert my world to Java and then back to Bedrock to fix the world save so that now it will work with the current Bedrock version.