Entity reference conditionals are broken by the storing of null values. The edit form for conditionals shows the following warning:
Warning: array_flip(): Can only flip STRING and INTEGER values! in Drupal\Core\Entity\EntityStorageBase->loadMultiple() (line 261 of core/lib/Drupal/Core/Entity/EntityStorageBase.php)
The culprit is is L40 of Drupal\conditional_fields\Plugin\conditional_fields\handler\EntityReference which loads empty values. However, simply using array_filter to get rid of them at that stage only masks the real problem.
When using select lists, the "null" value makes it into the visibility check and so the fields are never made visible,
Add a conditional from any field to an entity reference (i.e taxonomy) field and select any value from the taxonomy. Returning to the edit form will show a warning. Attempting to make the field visible on the entity form by selecting the value from the a dropdown does not show the field.
Unset any invalid target_id values from the ConditionalFieldEditForm submit handler.
Needs review
4.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
+1 for the patch
the conditions needs to be resaved and the cache cleared
@jigish.addweb That looks like a re-hash of a patch from a different issue, with no comment this looks like spam.