no search_api_solr results when search term ends with number
I would try this.

Go into The solr server configuration - assuming it's named 'solr'
/admin/config/search/search-api/server/solr/edit

In Advanced, see if "Targeted content domain" is set to scientific. And see the description next to it to see why I'm thinking this might be your issue.

Save. You'll probably need to re-export your config zips and definitely need to clear and re-index.