This file works in a localhost to test b2evolution and supersedes the previous file posted elsewhere. Note that it assumes your have PHP 7.4 FPM (see relevant line in configuration) and that you replace servername; (again, locate relevant line below) with whatever your localhost is assigned.

  server {
    ## listen :443;
    listen 80 default_server;
    listen [::]:80 default_server;
    root /var/www/b2evolution;
    index  index.php index.html index.htm;
    ## server_name  domain.tld;
    server_name _;

    etag on;
    client_max_body_size 128M;

    location ~* /htsrv/getfile.php/(.*)$
    {
        try_files $uri /htsrv/getfile.php?$args;
    }

    location ~* \.(png|jpg|ico|cur|gif|pdf|zip|jpeg|ttf|eot|woff)$
    {
        aio threads;
        gzip on;
        gzip_static off;
        add_header Cache-Control "max-age: 86640";
        access_log off;
        log_not_found off;
        etag on;
    }

    location ~* \.(js|map|html|css|json|htm|xml|txt)$
    {
        aio threads;
        add_header Cache-Control "max-age: 86640";
        access_log off;
        log_not_found off;
        etag on;
    }

    location /api/
    {
        auth_basic          off;
        rewrite "^/api/v(?<version>[^/]+)/(?<parameters>(.+))$" /htsrv/rest.php?api_version=$version&api_request=$parameters last;
    }

    location /go/
    {
        rewrite "^/go/(?<key>(.+))$" /htsrv/track.php?key=$key last;
    }

    if ( $http_user_agent ~* (nmap|nikto|wikto|sf|sqlmap|bsqlbf|w3af|acunetix|havij|appscan) ) { return 403; }

    location / {
        try_files $uri $uri/ /index.php?$args;
       }

    location ~ \.php$ {
            include /etc/nginx/fastcgi_params;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

        fastcgi_buffers 8 128k;
        fastcgi_buffer_size 256k;
        fastcgi_read_timeout 3000;
        fastcgi_keep_conn on;
        fastcgi_index index.php;
            fastcgi_pass           unix:/run/php/php7.4-fpm.sock;
     }

    location ~ /\. { deny all;  internal;}  
    location ~ /\.svn|/\.git { deny all; internal; }
    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt { access_log off; log_not_found off; }

    location ~ /.well-known {allow all;}        

  }

Note that b2evolution on Nginx will not get its time zone (during installation) and/or memory from the values in
/etc/php/7.4/fpm/php.ini

but rather b2evolution on Nginx will obtain those values from
/var/www/b2evolution/conf/_advanced.php

i.e.,
$date_default_timezone = 'Mexico/Tenochtitlan';

and/or
// @ini_set( 'memory_limit', '128M' );
@ini_set( 'memory_limit', '256M' );

I used a similar local B2evo/Nginx installation to produce the previous post screenshots.