Universal Minecraft Converter
The Universal Minecraft Converter is a tool by oPryzeLP to help you port content from the Java Edition of Minecraft to the Bedrock Edition. With the converter, you can do 28 different conversion types which has never been seen before in the Minecraft community.
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View on Official Website
From testing and regular everyday usage, it works a lot better than the competitors that were tested. There weren't chunk error, and everything just worked fine. There is a lots of settings to control different things about the conversion process and it is easy to get them confused but you can view the Documentation on every conversion type and how to do it.
From testing Chests, Entities, minecarts, waterloged blocks, and modified entities (like saddle horses and donky with a chest) they worked just fine and had everything where it was on Java.