This is the theme URL I'm using:
      https://jenkins-contrib-themes.github.io/jenkins-material-theme/dist/material-light-blue.css

      Then I have a build with the timestamp and ansi color wrappers and one shell step that does this:

      #!/bin/bash
      
      echo "This looks terrible"
      echo -e "\e[31m This is red\e[0m"
      echo -e "\e[32m This doesn't reset"
      echo "The end"
      

      The attached screenshot is the build output. It does not do this with timestamper 1.8.4 (which we had previously).

      This seems to be related to JENKINS-34019

          [JENKINS-38390] Timestamp background color white

          Ben Dean created issue -
          Steven G Brown made changes -
          Link New: This issue is duplicated by JENKINS-38573 [ JENKINS-38573 ]
          Steven G Brown made changes -
          Link New: This issue relates to JENKINS-34019 [ JENKINS-34019 ]
          Steven G Brown made changes -
          Resolution New: Fixed [ 1 ]
          Status Original: Open [ 1 ] New: Resolved [ 5 ]

            stevengbrown Steven G Brown
            b_dean Ben Dean
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              Created:
              Updated:
              Resolved: