Planner output is empty when using Fast Downward

[victorpaleologue]

When running the PDDL test using the following planner configuration

        {
            "kind": "COMMAND",
            "path": "/Users/victor.paleologue/Code/Palaio/HTN/downward/fast-downward.py",
            "syntax": "$(planner) --alias=lama $(options) $(domain) $(problem)",
            "title": "fast-downward.py",
            "canConfigure": true
        }

I get the output in a file called sas_plan, but not displayed in the output panel.
The VSCode extension does not leverage the --plan-file option, nor has any sort of contract with FD, which is a widely used planner.

[manyworldspublishing]

I'm also seeing this behavior. The extension reports that a plan was found, but does not display the plan or tell me where (if anywhere) it was written to disk. Can you provide some advice for using Fast Downward with the extension? FD is the basis for many other planners.