GraphQL API : linking issue to PR and updatePullRequest bug with projectIds

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Bug

Hello,

I'm having two issues and I would like to know if other persons have the same.

First one is how to link an issue (not a pull request) to a pull request by using GraphQL API. I've been looking in the documentation but with CreatePullRequest or UpdatePullRequest I don't see input allowing that.

I would like to know if someone know another way to do that ?

Second one is that with UpdatePullRequest I have the following error (value is xxxx for security):

{"data":{"updatePullRequest":null},"errors":[{"type":"NOT_FOUND","path":["updatePullRequest"],"locations":[{"line":2,"column":9}],"message":"Could not resolve to P
roject node with the global id of 'PVT_xxxxxxxxx-8'"}]}

I've added the header 'X-Github-Next-Global-ID': 1 but it doesn't do anything. Even with Github Explorer i'm having this issue.

By the way, the id of project come from this query :

query {
      repository(owner:"xxxxxxxxxx", name: "xxxxxxxxxx") {
        pullRequest(number:xxxxxxxxx){
          title,
          body,
          assignees(first:1){
          nodes{
                  id
              }
          }
          url
          projectsV2(first:1){
            nodes{
              id
            }
          }
          milestone{
            id
          }
          closingIssuesReferences(first:1){
            nodes{
              id
            }
          }
        }
      }
    }

Thanks in advance for any help :)