bash process substitution scoping

actual output (bash 4.3.33)

$ ./procsubtest.sh
Bash version: 4.3.33(1)-release
grep: /dev/fd/63: No such file or directory
grep: /dev/fd/63: No such file or directory
grep: /dev/fd/63: No such file or directory
grep: /dev/fd/63: No such file or directory
grep: /dev/fd/63: No such file or directory

expected output (bash 4.2.37)

$ ./procsubtest.sh
Bash version: 4.2.37(1)-release
/dev/fd/63:50857f1ad67ccb5eece006b4ea5b97f326574168  -
/dev/fd/62:b3a4c917040ac2eaf6cac8b5d271b150ff46505f  -
/dev/fd/61:47a6bcafda11aea91c8aa3e22f6db529edd83cd9  -
/dev/fd/60:1d9e85d9814b49ccfd874fc5a8c2baae53d3e093  -
/dev/fd/59:b73a56f7d07c9acf98d6797899a80f10a20b8cbf  -

procsubtest.sh

#!/bin/bash

echo "Bash version: $BASH_VERSION"

function startPipes() {
  # wrapped in a function so process substitution pipes stay open until the call
  declare -a fargs
  for i in 1 2 3 4 5; do
    fargs+=(<(head -c 10 /dev/urandom | sha1sum))
  done
  grep -H . "${fargs[@]}"
}
startPipes