show product in subcategory by "group by category" setting

Hello
This is a simplified version of my problem:
I have a category called A and I have two subcategories called subA1 and subA2. I have two products named C and D. I set up a menu to display the products (hikashop Product Listing menu). In the menu settings, I set the value of "main category" to A and put product C in subA 1 and product D in subA 2. I also set the sub "element filter" value to "Grouped by category". When I check the front of the site, it does not display any products. If I put those two products C and D in category A with the aforementioned settings(don't remove from it's subcategory subA1 and subA2), the front of the site will display three parts of category A, category subA 1, and category subA2 with repeated product. I want to have a parent category that does not have any products and all products are placed in its subcategories and the menu created by me will intelligently display the products in their own categories.

hello and excuse me for late to reply.
The problem still persists.
i use product category and it seems it work correctly and it seems problem with Vendor category.also i update hikashop to 4.6.2.

i do that as soon as possible. i must create a test for you. original site has persian language and maybe hard for you

it is ready to test:

lmssazan.ir/pl
is my implemented problem. i send you admin user pass and also ftp.
if you change product A and product B from its category you can see the result.

hi
I apologize for the wrong password, but I had sent the correct email 10 minutes after that wrong email.is it possible check that?

ok thank you for fix my problem but this site is a testing site. can you say when you release the next version of hikashop?

is it possible say me where need to modify? because i can not update my hikashop and need this solution to resolve that problem.
if you say me which file need to modify i can do that.
thank you (i understand that it may be difficult for you after this time)