Issues in Permission Sensitive Caching

Hello,

We have configured SAML for the directory /content/ and enabled auth_checker for all the *.pdf files in AEM 6.2

So, In new session when we hit the pdf URL directly in browser for first time (no cache) it's redirecting to IDP page correctly but when the file is already in cache and if we hit that pdf URL in browser it's trying to invoke auth_checker service (/bin/permissioncheck.html) with the SAML enabled url path [1] but it's getting 302 redirect to AEM login instead of IDP redirect.

It's redirecting fine when there is no cache created. Can some one please let me know if any other configuration need to enabled specifically for this auth_checker scenario.

[1]

https://stage.test.com/libs/granite/core/content/login.html?resource=%2Fbin%2Fpermissioncheck.html%3Furi%3D%2Fcontent%2Fdam%2Fdocuments%2Fus%2F%252bProcess%252bUpdate%252bNPSB13_121.pdf&$$login$$=%24%24login%24%24&j_reason=unknown&j_reason_code=unknown

Thanks,

GVK