Thanks so much, I’ve resolved the problem.
When I did “LIKE %bulletproof_security%”, I found I didn’t have bulletproof_security_options_net_correction. I checked my WordPress xx_options table structure. Its option_id lost an extra field option AUTO_INCREMENT. I gave it to the option_id and did the steps again. The Notice has gone away.
I think this AUTO_INCREMENT trouble is maybe caused by phpMyAdmin bug that I read several days ago. I re-imported some tables by such phpMyAdmin version about 20 days ago.
My web server is at my own house and has unique environments because I’m an early adopter. MariaDB is not bad. Interesting?