Graphql service returning Internal Server Error when calling subscription operation

[MohamedSabthar]

Description:
Graphql service returning Internal Server Error when calling subscription operation. The error returned when http:Listener passed as an argument of graphql:Listener. Passing the port number instead of http:Listener works without any issue

Steps to reproduce:

import ballerina/graphql;
import ballerina/http;

public type Review record {|
  int score;
  string description;
|};

table<Review> reviews = table [
    {score: 20, description: "GOOD"},
    {score: 20, description: "BAD"}
];

service /reviews on new graphql:Listener(check new http:Listener(9090)) {
    resource function get latest() returns Review {
        return reviews.toArray().pop();
    }
    
   // this works fine for service /reviews on new graphql:Listener(9090)
    resource function subscribe live() returns stream<Review> {
        return reviews.toArray().toStream();
    }
}

Affected Versions:
2201.2.x

OS, DB, other environment details and versions:

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      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.