Reproduction steps:

• Go on ci.jenkins.io
• Click on the search
• Type "junit"
• The first results, displayed with a magnifying glass icon, click on "junit-plugin"
• It will redirect you to https://ci.jenkins.io/job/junit-plugin/ which is a 404

Note: it's working whatever is the page you are currently at when you do the search (= it's not a relative path issue)

Expected link result: https://ci.jenkins.io/job/Plugins/job/junit-plugin/

Hypothesis (I haven't dig into the code), it's coming from organization folder feature, not providing correct links to the search capability.

Note2: the build links for junit-plugin are working fine.