Can you share a loom video? The test workflow is also working fine, are you passing the required queries? timezone, email, etc? The logs also shows success for workflow.
Okay, the issue is in the logic the custom node - "Shifts", It does not completes execution and keeps running resulting in failed to execute, the variable passed in the weeklyShift is of type object and in the node logic it is defined as string, you'll require to modify it accordingly.