Change record status: 
Project: 
Introduced in branch: 
8.x-2.x
Introduced in version: 
8.x-2.0
Description: 

All the processors check field access before processing and entity access before generating new custom element.
New CustomElementsProcessorFieldUtilsTrait was introduced and used in all the processors.
All custom processors also highly encouraged to use it.

After using the CustomElementsProcessorFieldUtilsTrait trait in the processor class you will be able to check access like this:
$paragraph_access = $this->entityIsAccessible($paragraph, $element));
$field_author_access = $this->fieldIsAccessible($paragraph, 'field_author', $element));
Note: custom element should be forwarded to add cacheable dependencies.
More examples can be found in processors implementations from custom_elements_thunder sub-module.

Impacts: 
Module developers