Block content #attributes not being added to top level render element.

I've tried but could not reproduce the reported issue. Please, provide steps to reproduce it.

I lost track of the original cause/error for this as this is so long ago, but I think this also happens/triggers a similar error when setting up a search API view/search with facets placed above the search in a views_block_area and enabling AJAX.
In this situation, I get
{"message":"No facet link or facet blocks found."}', name: "AjaxError"
I found a note stating:

The problem is that the "block-facets-ajax" class is not being added to the rendered block.

Sorry for being so vague, but maybe that helps in tracking this down somewhat.

If anyone of the contributors could retest it with the current dev version and update the patch, I'll be glad to merge it.

Just tested with current stable and I cannot reproduce it anymore - at least not the problem I mentioned above.
I think I am of no big help, then.

I'm not on a project currently using this module, and not sure I have to time to spin up a test soon, but part of the reason that the issue isn't reproducing visibly anymore is that QuickEdit was removed from Drupal core in 10.0.0 → . Not having looked at the module code, it's possible block attributes are still missing, just that without QuickEdit, it's not obvious.