This is somewhat hard to reproduce. It appears to happened after I ran a program to submit 1000 workflows as fast as I can. Each execution spends up to 20 seconds hitting a local server that intentionally returns an error ~50% of the time.
The workflow executions appear to have worked fine. There, however, does appear to be an error in the UI. Here, the listing page shows one workflow (starting with “253d…”) in the “Running” state.
However, the summary page for the specific run shows it as Failed
Hope this is useful. If it makes sense to create a github issue for it, let me know.