michaelneale Attached support bundle with all slave information edited out.
Additional info:
The link presented in the "Open Blue Ocean" link is this:
http://jenkins/blue/organizations/jenkins/test_jobs%2Fenv-scripted-test , ERROR 404
But the link in from the main blue ocean page is this:
http://jenkins/blue/organizations/jenkins/test_jobs%2Fenv-scripted-test/activity
This is even more interesting.... this works when pressed, but fails with a 404 if entered manually (copy/paste) into the address bar.
This entered manually (with ending '/') works:
http://jenkins/blue/organizations/jenkins/test_jobs%2Fenv-scripted-test/
But without the slash it fails with a 404:
http://jenkins/blue/organizations/jenkins/test_jobs%2Fenv-scripted-test
fkykko what version of Blue Ocean are you running?