Really not sure exactly what's going on, whether it's Bulma or Block Field to blame. Related issue there: https://www.drupal.org/project/block_field/issues/3216743 💬 Difference in template suggestions between 'regular' block and same block via block_field Postponed
But here's the error, that can at least avoid being a fatal on
[01-Jun-2021 18:47:18] WARNING: [pool www] child 26403 said into stderr: "NOTICE: PHP message: Error: Call to a member function getRegion() on null in /var/www/html/web/themes/contrib/bulma/bulma.theme on line 209 #0 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(287): bulma_preprocess_block(Array, 'block', Array)"
Fixed
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I do agree with @mlncn, this is not a bug originating from this project, but the proposed fix solves it when using this theme, so merging this
Automatically closed - issue fixed for 2 weeks with no activity.