Nonexistente URLs redirect to homepage. I’m using NginX

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If I go to https://sequential.design/randomURL (which doesn’t exist on my WordPress site), I am redirected to my homepage. It can be any URL, for example: https://sequential.design/imthepresident https://sequential.design/givemechocolate.

I want these nonexistent URLs to redirect to the WordPress 404 page. I’m using plain permalinks. If I switch to other kinds of permalinks, I can get nonexistent URLs to redirect to the 404 page, but not when I use plain permalinks (which is what I want to use). How can I get nonexistent pages to redirect to my 404?

I’m using NginX. Here is the beginning part of my server block configuration settings:

server {
    server_name sequential.design www.sequential.design ;
    root /var/www/sequential.design;

    index index.html index.htm index.php;

    location / {
        #try_files $uri $uri/ =404;
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
     }

    location ~ /\.ht {
        deny all;
    }

        location ~ ^/\.user\.ini {
        deny all;
        }

        location = /favicon.ico { log_not_found off; access_log off; }
        location = /robots.txt { log_not_found off; access_log off; allow all; }
        location ~* \.(css|gif|ico|jpeg|jpg|js|png)$ {
                expires max;
                log_not_found off;
    }