Using Open3.capture3 fails when running with java21 from a warbler jar with

ERROR: org.jruby.embed.EvalFailedException: (EBADF) Bad file descriptor - ls

This works correctly with java 11 and warbler, or with java 21 and no warbler. This is tested on jruby 9.4.12 and warbler 2.0.5.

I simplified the Open3 code down to this repro:

out_r, out_w = IO.pipe

pid = spawn('ls', out: out_w)

wait_thr = Process.detach(pid)
out_w.close
begin
  out_reader = Thread.new { out_r.read }
  output = out_reader.value
  puts output
ensure
  out_r.close
  wait_thr.join
end

When running this, it will fail at spawn. Spawning without an output pipe works fine in the java21+warbler configuration.