https://github.com/systemd/systemd/pull/39988#issuecomment-3614663676
and am closing the GNU grep bug report.
This is not a bug in GNU grep; it's documented behavior. I replied to
the systemd bug report here:
- bug#79946: grep -q exits too early and causes EPIPE in the pip... Yu Watanabe
- bug#79946: grep -q exits too early and causes EPIPE in th... jackson
- bug#79946: grep -q exits too early and causes EPIPE in th... Paul Eggert
