Steps to recreate in a blacklight dev instance:

1. Run rake blacklight:index:seed

2. In your catalog controller, add a clause_params configuration, e.g.

   config.add_search_field('title') do |field|
     field.solr_parameters = {
       'spellcheck.dictionary': 'title',
       qf: '${title_qf}',
       pf: '${title_pf}'
     }
     field.clause_params = { edismax: {} }
   end
   

3. Do a title search for medicin

4. Note that you do not get "Did you mean Medicine?"

I'm running solr 8.4.1, but I suspect that it is in the blacklight layer, not the solr layer.