Kong Plugin Grpc Web not work when server throw back an error response

Hi, we are currently testing 2 grpc-web support tool for our project,
1st is Kong Plugin Grpc Web with Kong gateway.
2nd is Envoy Proxy with Kong gateway.

All runs well if no exception is thrown from gRPC Server.
As gRPC return back error response, this plugin did not return back any response to the web client, Envoy Proxy did return the error response !

Could you please check that case ?
We are looking forward to hearing from you !
Thank you !

Please do not cross post on multiple forums.

Closing this as this is continuing on https://github.com/Kong/kong/issues/5988