[Test Breakage 2.46.0-rc0] Test t0021.35 fails on NonStop

Here is the breakage. I included the prior test log in case there was a dependency.

checking prerequisite: TTY

mkdir -p "$TRASH_DIRECTORY/prereq-test-dir-TTY" &&
(
        cd "$TRASH_DIRECTORY/prereq-test-dir-TTY" &&
        test_have_prereq PERL &&

        # Reading from the pty master seems to get stuck _sometimes_
        # on Mac OS X 10.5.0, using Perl 5.10.0 or 5.8.9.
        #
        # Reproduction recipe: run
        #
        #       i=0
        #       while ./test-terminal.perl echo hi $i
        #       do
        #               : $((i = $i + 1))
        #       done
        #
        # After 2000 iterations or so it hangs.
        # https://rt.cpan.org/Ticket/Display.html?id=65692
        #
        test "$(uname -s)" != Darwin &&

        perl "$TEST_DIRECTORY"/test-terminal.perl \
                sh -c "test -t 1 && test -t 2"

)
+ mkdir -p /home/randall/git/t/trash
directory.t0021-conversion/prereq-test-dir-TTY
+ cd /home/randall/git/t/trash
directory.t0021-conversion/prereq-test-dir-TTY
+ test_have_prereq PERL
+ uname -s
+ test NONSTOP_KERNEL != Darwin
+ perl /home/randall/git/t/test-terminal.perl sh -c test -t 1 && test -t 2
Can't locate IO/Pty.pm in @INC (you may need to install the IO::Pty module)
(@INC contains: /usr/lib/perl5/site_perl/5.30.3/nonstop_kernel
/usr/lib/perl5/site_perl/5.30.3 /usr/lib/perl5/5.30.3/nonstop_kernel
/usr/lib/perl5/5.30.3 /usr/lib/perl5/site_perl) at
/home/randall/git/t/test-terminal.perl line 5.
BEGIN failed--compilation aborted at /home/randall/git/t/test-terminal.perl
line 5.
error: last command exited with $?=162
prerequisite TTY not satisfied
ok 34 # skip delayed checkout shows progress by default on tty (pathspec
checkout) (missing TTY of PERL,TTY)

expecting success of 0021.35 'delayed checkout ommits progress on non-tty
(pathspec checkout)':
                test_delayed_checkout_progress ! git checkout $opt

+ test_delayed_checkout_progress ! git checkout .
test_delayed_checkout_progress: test: argument expected
error: last command exited with $?=127
not ok 35 - delayed checkout ommits progress on non-tty (pathspec checkout)
#
#                       test_delayed_checkout_progress ! git checkout $opt
#
1..35

-- Brief whoami: NonStop&UNIX developer since approximately UNIX(421664400) NonStop(211288444200000000) -- In real life, I talk too much.