Session Expired error with new Angular Web Portal via Load Balancer

Hello, we are experiencing some issues with the new Angular Web Portal. We are testing the load balancer configuration with sticky session based on the persistency of the cookie ss-pid. When we try to connect to the Web Portal (/ApiServer/html/qer-app-portal), as soon as we land on the page, we receive a blank page (inspecting the page, there are some 404 on the content components of the page). After a refresh of the page, every component are displayed correctly. Once we authenticated, the page shows the error "Your session has expired. Please reload this page and login again. [57002006]". We configured on the Designer the following fields: QBM - ApiServer - SameSiteCookie=none
We tried also using the "old" web portal, IdentityManager, but we are not experiencing any error.
Coudl you help us to understand what is the problem?