When I export the configuration as code definition of my Jenkins server that has JGit configured as one of the git implementations, it includes lines like this:

tool:
  git:
    installations:
    - home: "git"
      name: "Default"
    - home: "jgit"
      name: "jgit"

When I load those lines into configuration as code, it attempts to create a command line implementation of jgit instead of creating the internal implementation of jgit. The result of reloading that configuration looks like this: