Auth session notes disappear in between requests

Hi there-
We’re using keycloak 16.1.0 and customized authenticator and login/registration flows. We’re facing issue that notes put in authentication session during registration disappear intermittently before subsequent request that reads them. This happens before user is logged in. I could confirm that browser is passing cookies correctly, can this be due to auth sessions dropped on the server? We’re using default in-memory sessions and are in Kubernetes using bitnami/keycloak chart. Could someone offer any advice or have experienced similar issue?