I've got a simple block plugin that has a node context. I've added it to a paragraph type that has a block field reference. The block itself works OK, however when saving the settings, I am getting the following error:
InvalidArgumentException: The configuration property default_value.0.settings.context_mapping.node doesn't exist. in Drupal\Core\Config\Schema\ArrayElement->get() (line 76 of core/lib/Drupal/Core/Config/Schema/ArrayElement.php).
I think the issue has been reported with "several flavours" but none of the patches / workarounds have worked for me, it seems that the form doesn't check for the right structure on BlockFieldWidget.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This is working for me in a pretty minimal use case. Thanks @pcambra!
Patch #3 fix fixed the error, but the default value is not set on the form display even though a default value is set.