For my setup, the nodes listing page is:
https://localhost:5601/app/monitoring#/logstash/nodes
When I click on a node, it goes to:
https://localhost:5601/logstash/pipelines/test
which results in a 404. The right url is:
https://localhost:5601/app/monitoring#logstash/pipelines/test
Does applying that to your environment work too?