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Thanks for the suggestion, but I’m not willing to use a PHP version which has a lot of vulnerabilities.

It turns out that is the problem– PHP 8 compatibility (#Ref). Let’s wait and see.

I used the same installation on a webserver, and it works!
What is the problem I’m having on my localhost?
BTW, even when I used AppServ localhost (with PHP ~7.3.2) , WordPress showed errors.