Our application uses pega 7.3.1 , PM 7.31 and CRM 7.31. We are observing below errors in log.

com.pega.pegarules.session.external.mgmt.PageCannotBeSerializedForPassivationException: Unable to passivate page 'pxRequestor' on thread 'null' in requestor 'HHUX52PRQ683AN76SVP7OH71A2H5Y1QU0'. The following items were not serializable: [Property not serializable: "pxRequestor.pxHTTPServletResponse" Class: "weblogic.servlet.internal.ServletResponseImpl"].

PFA, complete error trace.

I could see hotfix is available for the same issue in 7.2.2 in link https://community.pega.com/support/support-articles/unable-passivate-page-pxrequestor

Is this issue fixed in 7.3.1?