When POST request access policy is used, it is not forwarded to the server behind.

Hello,
I have a virtual server (Virtual-ext with policy Forward-int) that forwards all traffic from the internet to the inside with policy. I have an Access policy (Auth-AccPolicy) that I run for authentication on my virtual server (Virtual-int) serving internally.  The post method is used in java scripts within the page. But when the Acces -policy is activated the post methods are not forwarded to the back.

Why are POST methods affected by Acces policy? I can't find anything on this. My version is : 15.1.3.1

I would be grateful if you could share me information about the solution.