Blocks, Media, Images not working for Paragraphs, and (nested) referenced Entities in general

Problem/Motivation

My use case is using the Layout Paragraphs module, so mostly filling an Entity Reference Revisions field with Paragraphs Types.
My Paragraph Types are using simpler Text fields (short, long formatted, etc.) but also other referencing other entities (Media, Blocks, Images)
I am exporting my default content in a "custom_default_content" custom module, with the following commands:

drush dcer node --folder=modules/custom/custom_default_content/content -y
drush dcer paragraph --folder=modules/custom/custom_default_content/content -y
drush dcer media --folder=modules/custom/custom_default_content/content -y
drush dcer file --folder=modules/custom/custom_default_content/content -y

The basics Paragraph types composed just by Text (short, formatted) fields are correctly generated enabling the "custom_default_content" custom module

Instead all the others more complex Paragraph Types referencing other entities (Media, Blocks, Images) are never generated/recreated ...

What am I missing?
What is the 2.x branch missing? Is it still so experimental that it is unable to implement nested entity reference fields?

Relating this to a parallel issue related to Layout Paragraph module.