network-no-diff test is broken for both 1.4.0 regression build and head build

[chenrui333]

While upgrading protobuf to 27.2, I am seeing some regression test failure for network-no-diff.test

ERROR: network-no-diff
======================

%begin 1719699304 265 0
%end 1719699304 265 0
%window-add @0
%sessions-changed
%session-changed $0 0
%window-renamed @0 bash
%sessions-changed
%exit
Running server test baseline.
select() with zero timeout called too often on server during baseline
travis_fold:start:network-no-diff.test-baseline.tmux.log
%begin 1719699304 265 0
%end 1719699304 265 0
%window-add @0
%sessions-changed
%session-changed $0 0
%window-renamed @0 bash
%output %0 \015\015\012\015\012
%output %0 \033[?1049h\033[?1h\033[?5l\033[r\033[0m\033[H\033[2J\033[?25l\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\012\033[K\033[1;1H\033[?25h\033[0m\033[?2004l\033[?1003l\033[?1002l\033[?1001l\033[?1000l\033[?1004l\033[?1015l\033[?1006l\033[?1005l
%output %0 \033[?25l\012x\015\033[?25h
%window-renamed @0 perl5.30
%output %0 @@@ server complete @@@
%paste-buffer-changed buffer0
%output %0 @@@ runtime   0:00.07 @@@\015\012
%output %0 \033[?1l\033[0m\033[?25h\033[?1003l\033[?1002l\033[?1001l\033[?1000l\033[?1015l\033[?1006l\033[?1005l\033[?1049l
%output %0 [mosh is exiting.]\015\012
%output %0 @@@ exitstatus: 0 @@@\015\012
%sessions-changed
%exit
travis_fold:end:network-no-diff.test-baseline.tmux.log
ERROR network-no-diff.test (exit status: 99)