Terminal.processId is null immediately after creating the terminal

[sandy081]

Testing #12595

context.subscriptions.push(vscode.commands.registerCommand('extension.createTerminal', () => {
        if (!myTerminal) {
            myTerminal = vscode.window.createTerminal('my terminal', 'bash', ['-v']);
            myTerminal.processId.then(value => {
                vscode.window.setStatusBarMessage('' + value);
            });
        }
    }));

Above code fails because, myTerminal.process is null.
This is not expected because it is a promise.

[Tyriar]

Duplicate #12770