Kibana login (Openid/Azure AD) is not working after upgrading to 1.10.1 from 1.8

I have opendistro 1.8 and Elasticsearch/kibana is configured to use openid/Azure AD for authentication. It is working well.
I have performed the upgrade to 1.10.1. Cluster is green but kibana authentication is failing:

{"statusCode":400,"error":"Bad Request","message":"[request query.session_state]: definition for this key is missing"}

Did something change in 1.10.1 and was not documented in the upgrade steps?

Hi @sushovan,

Sorry for the issues faced by upgrading the ODFE to v1.10.1. We have added the instructions to address this. Please check https://opendistro.github.io/for-elasticsearch-docs/docs/upgrade/1-10-1/
Please let us know if you continue to face the issue.
Thanks!

update here - https://github.com/opendistro-for-elasticsearch/opendistro-build/issues/416#issuecomment-703915285 has resolved the issue. waiting for official release