(iam): CDK always detecting a change when there is none

[gaetansnl]

Describe the bug

I have two account with trust.

I have one stack called stackA with a property role of type iam.Role
Then in a second stack in another account i reference stackA.role.roleArn

Everything works fine, but everytime I do cdk diff I have this diff

           [-]     "Resource": "arn:aws:iam::1234:role/test"
            [+]     "Resource": {
            [+]       "Fn::Join": [
            [+]         "",
            [+]         [
            [+]           "arn:",
            [+]           {
            [+]             "Ref": "AWS::Partition"
            [+]           },
            [+]           ":iam::1234:role/test"
            [+]         ]
            [+]       ]
            [+]     }

So it seems that it needs a function to get the string aws

Expected Behavior

No diff

Current Behavior

A diff

Reproduction Steps

export class StackA extends cdk.Stack {
  public role: iam.Role;
  constructor(
    scope: Construct,
    id: string,
    props: SackAProps,
  ) {
    super(scope, id, props);
    this.role= new iam.Role(this, "user-role", {
      roleName: props.exportedResourcesPrefix + props.userRoleName,
      assumedBy: new iam.ArnPrincipal(props.userArn),
    });
  }
}
const isntanceA = new StackA() ....
  new StackA(app, `xxxxx`, {
    allowedRolesArn: [
     isntanceA.role.roleArn
    ],
    env: {
      account: "otherAccount",
      region: "eu-west-1",
    },
  });

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.103.1

Framework Version

No response

Node.js Version

v18.1.0

OS

ubuntu

Language

TypeScript

Language Version

No response

Other information

No response

[pahud]

Can you share a complete minimal sample code that we can reproduce in our environment?

e.g. SackAProps is not defined in your provided code.

[github-actions]

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[gaetansnl]

I will post better reproduction soon

[gaetansnl]

seems to work in latest version

[github-actions]

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