2 problem with Xhttp

Hi , the xhttp mode doesnt include in subscription link and its set to default  [auto] by client app , and there is another issue with stream-up mode ,because the outdated xray core the client with newer xray core cant connect to some xhttp config. 
In the most recent xray core the default auto mode sets to packet-up but still have incompatibilty in some client like v2rayN and strisand 
Thanks