Version 3.9.6 is not reproducible

Version 3.9.6 is not reproducible. It seems like the compiled classes are different.

• JDK used: OpenJDK version 8.412.u08
• Command line used:

  mvn package \
      -DbuildNumber="bc0240f3c744dd6b6ec2920b3cd08dcc295161ae" \
      -Dline.separator=$'\r\n' \
      -Dproject.build.sourceEncoding=UTF-8 -e \
      -Dmaven.repo.local="./repo" \
      -DskipTests
  

buildNumber is found from:

bsdtar xOf <(bsdtar xOf apache-maven-3.9.6-bin.tar.gz  apache-maven-3.9.6/lib/maven-core-3.9.6.jar) \
    org/apache/maven/messages/build.properties | grep buildNumber | cut -d= -f2 | tr -cd '[:print:]'

Relevant issue: https://issues.apache.org/jira/browse/MNG-6276