When selecting a job to copy from in the new job page, the suggestion list from ajax doesn't actually search for the string entered, this means that always the first 10 jobs are displayed.
this was probably introduced by the changes from March 11 to https://github.com/jenkinsci/jenkins/commits/master/core/src/main/java/hudson/model/ViewDescriptor.java

(This makes entering another job name appear impossible, since you tend to click into the suggestion list or move the cursor, however if you enter the complete name in the box and then click outside the suggestion list, you still are able to copy a job name)