When you create a view display block, there is no URL associated to it.
When the ViewsBlockFilterBlockPluginDisplayBlock class gets a form action URL for the exposed_form it tries the getLinkDisplay() function in core Views (https://api.drupal.org/api/drupal/core%21modules%21views%21src%21Plugin%...).
However if you have any displays in the same view which are pages, it will get the URL from the first one of these instead (which will often be incorrect).
Fixed
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This change causes white screens as reported here: https://www.drupal.org/project/views_block_filter_block/issues/3270164 → . And the solution proposed is to revert this change, as in this patch: https://www.drupal.org/files/issues/2022-06-13/views_block_filter_block-... →