Branch specification being ignored

[DennisHeimbigner]

I have the following at the beginning of my settings.gradle:

plugins {
  id 'me.champeau.includegit' version '0.1.5'
}
gitRepositories {
  include('netcdf-java') {
    uri = 'https://github.com/DennisHeimbigner/netcdf-java.git'
    branch = 'dap4fixes1.tmp'
  }
}

It is properly downloading and building the netcdf-java repo,
but it is ignoring the branch specification.
Is there something obvious that I did wrong?
p.s. I am using gradle 6.9