magento 2 samesite cookie issue

Job ID: 31311867

Budget: $10 – $30 USD

we need to fix samesite cookie issue (site A) about the 3rd party payment module (site B)
in detail:
when customer pay with cc(3ds) magento redirect home page instead payment success page,
credit card payments done, but in magento there is no order. also products exist in cart after redirecting homepage but customer logged out.

further information:
https://github.com/Veriteworks/CookieFix
https://github.com/magento/magento2/issues/26377
https://www.chromium.org/updates/same-site

platform:
magento 2.3.7, php 7.4, redis 6 varnish 6, nginx

I am confused after some googled cause cookie issue seems fixed in 2.3.7, maybe we dont have a patch or something
I need exprienced mage developer to found and fix our issue
Related categories: PHP JavaScript Magento eCommerce HTML