Maybe a good place to ask why my Thunderbird spam filter seems broken? It used to work fine, then something happened (maybe I deleted the emails in Junk but tha

Maybe a good place to ask why my Thunderbird spam filter seems broken? It used to work fine, then something happened (maybe I deleted the emails in Junk but that shouldn't affect the corpus). Now it doesn't seem to learn anything and I keep seeing the same Spam in the Inbox. This is with v102 on Win 10. Also with a few previous versions.