If you package a custom version of remoting and then run the resulting WAR, /about/ still claims to contain the stock version under Maven ID. This seems to be because tmp/output/target/*-SNAPSHOT/WEB-INF/classes/META-INF/licenses.xml still contains

<l:dependency name='Jenkins remoting layer' groupId='org.jenkins-ci.main' artifactId='remoting' version='3.25' url='http://jenkins-ci.org/remoting/'><l:description>Contains the bootstrap code to bridge separate JVMs into a single semi-shared space.
    Reusable outside Jenkins.</l:description>

If it is too much work to patch this file, suggest at least amending the documentation for patching core libraries to explain that this URL should be ignored.

Alternately, perhaps core should be looking at WEB-INF/lib/remoting-*-SNAPSHOT.jar!/META-INF/maven/org.jenkins-ci.main/remoting/pom.properties for overridden versions.