Drupal 8 Paragraph module error - This entity (paragraph: 309) cannot be referenced.

When saving a content type with paragraphs block used, produces an error - This entity (paragraph: xxx) cannot be referenced.

  • Created a custom content type
  • Needed to have a paragraph Header Block in place
  • Re-used an existing paragraph block used in another content type that serves the purpose
  • No error when creating a new item for this content type
  • However, when editing/updating the paragraph block of an already existing content item of this type, it produces an error "This entity (paragraph) cannot be referenced." 

Drupal and Modules 

Versions used and affected:

  • Drupal core 8.9.2
  • PHP 7.3.16
  • Paragraphs module 8.x-1.12 (Classic widget)

Tests and Research

Workaround / Solution

  1. Backup database and all relevant folders/directories/files
  2. Switch from Experimental field widget to classic Paragraphs mode (without the collapsible button/feature) - working for ADMIN role only, despite everything and necessary permissions are checked.
  3. Seems an outstanding issue for non-admin roles. See issues from Paragraph project page.
  4. Test updating the paragraph block of an item of this content type, OK!

Drupal paragraph widget error

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