## The problem
Issue PrefectHQ/prefect#15153 (closed, 50 comments): ### Bug summary Up until 3.0.0rc18 task run completions were registered correctly with a local Prefect server, but after that with 3.0.0rc19 and 3.0.0rc20 the list of task runs remain empty even after all tasks were completed successfully. So, nothing will be listed on a dashboard URL like that: the service URL for that host and port I am still investigating the issue, but downgrading helped to solved it for me.
## What fixed it
If task runs are missing from the Prefect 3.x UI, upgrade the server and client past 3.1.3, which fixed the likely cause, and check that the browser can establish the websocket connection to the server (newer versions warn when it cannot). The maintainer closed the original report once those fixes shipped; if it persists on current versions, open a new issue with a minimal repro.