/app/kibana redirecting (302) to /app/dashboard_mode Kibana 7.10.1

We embed Kibana within an Iframe in our application and forward the requests to Kibana server with basic authentications scheme.

This used to work in version 6.8.1 but when i upgrade to 7.10.1 the request to /app/kibana is redirecting to /app/dashboard_mode which is timing out eventually.

The following are the logs from kibana.log

{"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","http","server","Kibana","cookie-session-storage"],"pid":4703,"message":"Error: Unauthorized"} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","basic","basic"],"pid":4703,"message":"Trying to authenticate user request to /app/kibana."} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","basic","basic"],"pid":4703,"message":"Cannot authenticate requests with Authorization header."} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","http"],"pid":4703,"message":"Trying to authenticate user request to /app/kibana."} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","http"],"pid":4703,"message":"Request to /app/kibana has been authenticated via authorization header with \"Basic\" scheme."} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","app-authorization"],"pid":4703,"message":"authorizing access to \"kibana\""} {"type":"log","@timestamp":"2021-01-08T11:35:44Z","tags":["debug","plugins","security","app-authorization"],"pid":4703,"message":"authorized for \"kibana\""} {"type":"response","@timestamp":"2021-01-08T11:35:44Z","tags":[],"pid":4703,"method":"get","statusCode":302,"req":{"url":"/app/kibana","method":"get","headers":{"host":"10.96.2.19:8030","connection":"keep-alive","upgrade-insecure-requests":"1","user-agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36","accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9","sec-fetch-site":"same-origin","sec-fetch-mode":"navigate","sec-fetch-dest":"iframe","sec-ch-ua":"\"Google Chrome\";v=\"87\", \" Not;A Brand\";v=\"99\", \"Chromium\";v=\"87\"","sec-ch-ua-mobile":"?0","referer":"https://10.96.2.19:8030/","accept-encoding":"gzip, deflate, br","accept-language":"en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7"},"remoteAddress":"127.0.0.1","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36","referer":"https://10.96.2.19:8030/"},"res":

{"statusCode":302,"responseTime":12,"contentLength":9},"message":"GET /app/kibana 302 12ms - 9.0B"}

The same via cURL returns the following response

HTTP/1.1 302
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
X-Frame-Options: sameorigin
location: /xx/yy/zz/app/dashboard_mode
x-frame-options: SAMEORIGIN
kbn-name: ip-10-96-2-19
kbn-license-sig: ca5cbe96c1682c0374daf9e5f40cfb6a7e80100c2c4a704accaff6a1bc6b172a
cache-control: private, no-cache, no-store, must-revalidate
Date: Fri, 08 Jan 2021 11:57:49 GMT
Connection: keep-alive, keep-alive
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
Content-Type: text/html
Content-Length: 0
Keep-Alive: timeout=60

Questions
1 : Why is this redirection happening in 7.10.1 when it was not happening in 6.8.1 ?
2 : What is /app/dashboard_mode

Any help is appreciated

Following . I am facing same issue