Minecraft is only saving chunks that are built in and nothing else

It only saves chunks that I built in which explains why editor takes forever rendering in un built in chunks. That is why the pictures of the new camp and boat look misplaced. The boat is half underwater and the other is above water. But on android testing some new features of the drop It did the same thing with the desert temple. I repeated the same steps on the windows version and it did the same thing. Note that the bedrock editor world file size of 7 mb seems absurdly tiny even tough I traveled1200 blocks in each direction up to 4000 blocks looking at biomes to build in. It should be at least 50 mb - 1 GB of chunks saved.