CNC shaping not working via .htaccess?

Question

htaccess

There is a wordpress site with the wp-shop plugin that generates system pages like
mjstore.ru/products-page/?category=6&product_id=23
Generated a rewrite rule like
RewriteRule RewriteRule ^category-([^-]*)-product_id-( [^-]*)\.html$ /products-page/?category=$1&product_id=$2 [L,QSA]
# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^category-([^-]*)-product_id-([^-]*)\.html$ /products-page/?category=$1&product_id=$2 [L ,QSA]
RewriteRule . /index.php [L]
But for some reason, it's not that it doesn't work, so the site also stops loading. Please tell me where is the mistake.

Answer 1

It was
became

RewriteEngine On
RewriteBase /
RewriteRule ^category-([^-]*)-product_id-([^-]*)\.html$ /products-page/?category=$1&product_id=$2 [L,QSA]

But it seems to me that there will be more problems with get requests, and the regular season itself is strange.
Can I have a couple of URLs for viewing?
This is very embarrassing

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

similar to the condition for the cnc
which is triggered for
not for
Short cut your line below
RewriteCond - if
RewriteCond - if
RewriteCond -if
RewriteRule
-then RewriteRule - the next rule is not related to the first conds

Answer 2

An example of a url is this mjstore.ru/products-page/?category=6&product_id=23
I would like it to be transformed into this form:
mjstore.ru/products-page/page6
To do this, I made a new function:
RewriteRule ^products-page/ page([^/]*)$ /products-page/?category=$1&product_id=23 [L] [QSA]
To be honest, I didn't understand what the order should be. Such?
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^products-page/page([^/]*)$ /products-page/?category=$1&product_id=23 [L] [QSA]
Should I include another RewriteCond?