Simply not working

Let me add some info.
The apps are woocommerce + storefront, very standard.

Hello

Very strange! It looks like a third-party software removes the GET request

Thank you. Do you have any idea what kind of third-party software ? I use only very standard software only.

Hello

I do not know, as I described above, that removes GET requests.
after filtering, the link should look like this
Example: https://your_site.com/shop/?swoof=1&product_cat=t-shirt
In your case, this part of the link( ?swoof=1&product_cat=t-shirt ) has been deleted

It worked after deactivating some plugins. I don’t recognize which plugin was the cause. Thank you for your kind support.

Hello

Welcome;)