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G.M.’s comment was correct – this was a plugin issue. A legacy pagination plugin (“Multipage Toolkit”) I’d replaced from the old install was hijacking permalinks.

The plugin was no longer necessary as WP supports pagination natively. I removed the old plugin, reset permalinks again, and all was well.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)