Configset upload failed with error code 400

Just leaving a tip, since others might run into this: Remember to update Connector Workarounds - Solr version override from "8.x" to "Determine automatically".

I was upgrading to Solr 9.6.1 Cloud with Basic Auth but every time I tried to "Upload Configset" I got this error:

Message 	Drupal\search_api_solr\SearchApiSolrException: Creating collection solrcore failed with error code 400: Solr HTTP error: OK (400) 
{
  "responseHeader":
  {
    "status": 400,
    "QTime": 1040
  },
  "error":
  {
    "metadata": ["error-class", "org.apache.solr.common.SolrException", "root-error-class", "org.apache.solr.common.SolrException"],
    "msg": "Underlying core creation failed while creating collection: solrcore",
    "code": 400
  }
}
in Drupal\search_api_solr\Plugin\SolrConnector\StandardSolrCloudConnector->createCollection() (line 409 of /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/SolrConnector/StandardSolrCloudConnector.php).

It wasn't until I compared a working config with the problematic site, that I noticed an "8" in the config file, under solr_version: '8' in search_api.server.solr_server.yml. After I updated Connector Workarounds > Solr version override from "8.x" to "Determine automatically" I could finally "Upload Configset", as well as with Drush:

$ drush --numShards=1 search-api-solr:upload-configset solr_server
 [success] Solr configset for solr_server uploaded.

Previously I would get this error:

$ drush --numShards=1 search-api-solr:upload-configset solr_server
In StandardSolrCloudConnector.php line 409:
                                                                                                                                    
  Creating collection solrcore failed with error code 400: Solr HTTP error: OK (400)                                              
{
  "responseHeader":
  {
    "status": 400,
    "QTime": 924
  },
  "error":
  {
    "metadata": ["error-class", "org.apache.solr.common.SolrException", "root-error-class", "org.apache.solr.common.SolrException"],
    "msg": "Underlying core creation failed while creating collection: solrcore",
    "code": 400
  }
}


In Result.php line 73:

  Solr HTTP error: OK(400)
  {
    "responseHeader":
    {
      "status": 400,
      "QTime": 924
    },
    "error":
    {
      "metadata": ["error-class", "org.apache.solr.common.SolrException", "root-error-class", "org.apache.solr.common.SolrException"],
      "msg": "Underlying core creation failed while creating collection: solrcore",
      "code": 400
    }
  }

Leaving some details here, in case someone else run into the same strange errors.

Actually, would it be worth adding a warning at the top of the Solr Server page (admin/config/search/search-api/server/solr_server), like this?