Working only on some misspelled words

I have followed gotten this only partly working, on Drupal 10 for what it's worth. I have the view header configured to display both spelling suggestions and "did you mean".

Working example: if I search "pster" it will display:

"Did you mean: poster ?
Spellcheck keyword variations:
poster"

Not working: if I search "Annxation" or "annxation" it suggests nothing and shows now spelling errors either.

My Search API Solr fields include two aggregated fields, one for spellcheck and one for suggester. I set both up as a 'Auto aggregated fulltext field' (An automatic aggregation of all fulltext fields of the same kind of the same language.). I did also test setting these up as Title fields, but it made no difference. "Poster" and "Annexation" both exist in the titles of the nodes in my result set, so I am baffled why "Annxation" does not provide spellcheck or suggestion results. Maybe I need to adjust Solr somehow, or re-import my config.zip... I don't know and am hesitant to do this if not necessary. I can find precious little documentation.