Summary:

It seems the jungle biome is very scattered around the world and is generated in small pieces. This does not always happen, but I think I need to reduce the gap in the jungle biome.

Example:

413602034
-543 90 -543

An example of a jungle biome bursting by a mountain:

413602034
-435 113 374

Steps to reproduce:

1. Create a world with the specified seed with experimental gameplay enabled.
2. Visit the specified coordinates.

Observed results:

At the first coordinates, you will see a small jungle biome.

On the second coordinates, the jungle biome is ripped apart by two mountains.

Expected results:

It seems to me that the gap in the jungle biome should be a little less. And the jungle should not be generated as a microbiome.

Image: