Turns out that this issue was caused by attempting to re-use/re-purpose a VBP step.
I previously had a Batch File step that executed a .bat script to push files to a remote server. I later created a .py script to replace the batch script and just updated the VBP step with the new file.py. When I attempted to execute the step with the changed .py script, it failed with the error I noted above.
Dragging a new Batch File step into the project and configuring it to execute the .py script allowed it to work as expected.
This seems like a bug to me, but the workaround is a viable resolution.
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