Problem/Motivation: I got and error after installing the module
I downloaded the module, enable the module, and apply the format to a entity reference field called 'Banner' on Basic Page content type view mode.
The banner already have an editorial workflow applied as well as the Basic page
Them I edited a banner inside of a page an set it to draft mode. The page preview still rendered the published version of the banner and not the lasted review.
The result is a page rendered error Notice: Undefined index: #theme in Drupal\entity_reference_preview\Plugin\Field\FieldFormatter\EntityReferenceEntityPreviewFormatter->Drupal\entity_reference_preview\Plugin\Field\FieldFormatter\{closure}() (line 207 of modules/composer/entity_reference_preview/src/Plugin/Field/FieldFormatter/EntityReferenceEntityPreviewFormatter.php).
The error seem to be caused by the respective variable not existing in the template files.
Drupal core 9.3.8
Needs work
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Occurs with renderable array of BlockViewBuilder's viewMultiple method for me.
Created a patch for the issue mentioned, please review.
Thank You.