Resume to a suspended Workflow run

I am trying to return to a suspended workflow run using

workflow.createRunAsync({runId: ... })

workflow.createRunAsync({runId: ... })

and I see in the method that it is looking inside the run-map if the run already exists and than looks it up in the snapshot storage but never returns this data, but instead the one in the process run-map. Why is that? I want to resume to my workflow but this way it always creates a new pending one if i am not in the same instance of this workflow class. Like if I have two different requests. How would i approach this? – Like have a first API call that is starting the workflow and is causing a suspend and second request is continuing the same workflow using the latest workflow run with the specific runId. Help is appreciated