I have the exact same issue (just can’t comment because of WP policy): https://wordpress.org/support/topic/plugin-works-just-one-particular-post-is-not-found/
I tried to reindex but I still can’t find words with ü or ä etc.
In the DB, I have utf8mb4_german2_ci and words are stripped of these characters. Any ideas what could be the issue?
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