I am working on Magento ver. ce-220.127.116.11 and I have made some major customizations in Product's custom options Block file and also created couple of custom product types based on Simple product type.
The issue I encounter now is whenever I create a "Bundle Product" & "Grouped Product" in admin and then if I go to "Bundle Items" tab or "Associated Products" tab respectively and press "Reset Filter" button then it shows "No records found", eventhough, I have created one simple product and it is working in frontend.
Could this be due to custom product types I have created, though I have disabled the module and checked but still same erroroneous situation. The "Reset Filter" function for "Related", "Upsell" & "Cross-sell" product tabs is working fine.
Need some guidance as to how "Reset Filter" fetches simple products list for "Bundle" & "Grouped" products & what could be triggering the issue.