event does not work as expected (catalog_block_product_list_collection) in Magento 2.4.3

[zexperto]

Preconditions (*)

1. Magento 2.4.3
2. in general this issue appear in all Magento 2.4.x

Steps to reproduce (*)

1. install Fresh Magento 2.4.3
2. Create new Category (Ex: 'All Products')
3. Create 20 simple products (with any data), I used import products and I used this naming ('simpel-01','simple-02','simple-03',etc.)
4. open the Category page (All Products), {base_url}/all-products.html
5. sort products by name, so we can see the list of products like ('simpel-01','simple-02','simple-03',etc..)
6. use this event to filter the product list 'catalog_block_product_list_collection', I used this filter [$collection->addAttributeToFilter("sku",'simple-27');]
7. go to the category page and refresh the page, you will have this message 'We can't find products matching the selection.'
8. add this paratmer to the page {base_url}/all-products.html?p=2, you will see your filtered products

Expected result (*)

1. I expect to do the filter before Magento set the pagination and the product should appear in the first page

Actual result (*)

1. you have message that you do not have the filtered product but the product is exist in the next pages
   2.it looks like the filter happened only in the current page of products

---

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• this issue affect the whole logic of product visibility and make the event is useless, and it prevent any kind of filtration for the product list

[m2-assistant]

Hi @zexperto. Thank you for your report.
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[m2-assistant]

Hi @engcom-Lima. Thank you for working on this issue.
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[engcom-Lima]

Hi @zexperto,

Thank you for reporting the issue.

Can you please elaborate on point 6 ? Like where exactly in code are you using event 'catalog_block_product_list_collection' to filter out the product list based on name ? Need to check if it is relating to custom code which you have added for sorting.

If you can share the relevant code or any additional information which could help me in reproducing this would be appreciated.

Thanks

[zexperto]

@engcom-Lima , thank you for your response
here is the event.xml content
frontend/events.xml

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
	<event name="catalog_block_product_list_collection">
		<observer name="vendor_module_observer_frontend_catalog_blockproductlistcollection_catalog_block_product_list_collection" instance="Vendor\Module\Observer\Frontend\Catalog\BlockProductListCollection"/>
	</event>
</config>

and for the observer itself here is the code

  /**
     * Execute observer
     *
     * @param \Magento\Framework\Event\Observer $observer
     * @return void
     */
    public function execute(
        \Magento\Framework\Event\Observer $observer
    ) {
        $collection = $observer->getEvent()->getCollection();
        $collection->addAttributeToFilter("sku",'simple-27');
    }

here is a copy of the quick module
Vendor.zip

[engcom-Lima]

Hi @zexperto thank you for your Inputs!
Based on the information provided, I was able to reproduce the issue on 2.4-develop instance.

Steps followed to reproduce the issue:-

1. Install fresh Magento 2.4-develop instance
2. Create a new category (New Category)
3. Add some products to it eg. (simple-01, simple-02........simple-20) and assign it to our New Category
4. Open the Category page (New Category), {base_url}/new-category.html
5. Sort products by name, so we can see the list of products like ('simple-01','simple-02','simple-03',etc..)
6. Create a custom module and override the event to add additional filter for 'catalog_block_product_list_collection', I used this filter [$collection->addAttributeToFilter("sku",'simple-20');]
7. Go to the category page and refresh the page, you will have this message 'We can't find products matching the selection.'
8. Add this parameter to the page {base_url}/all-products.html?p=2, you will see your filtered products

Page 1:

Page 2:

As we can see in the second image after adding pagination in the url ?p=2 we are able to see the product but without pagination we get the following notice 'We can't find products matching the selection.'

Based on this confirming the issue.

Thanks!