404 when viewing pipeline after upgrade

Hi,

After upgrading from 13.12.5 to 14.0.7, we are no longer able to see the results of a pipeline by clicking on it:

Clicking on 215834 above takes us to a URL ending in /-/pipelines/215834, which returns a 404.
Any idea how we can fix this?
Thanks,
alec

I should add that the pipeline (a Jenkins integration) works fine, it’s just the link in the Gitlab UI in the screenshot that doesn’t.