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dnf check-update
dnf update
Reboot the server and the kernel became 4.18.0-513.11.1.el8_9.
All functions seemed to work fine except web server is showing a testing page.
Digging deeper and found /usr/lib/systemd/system/httpd.service was modified to default. The Apache server on the server is newer than the default one and I had created a working service file before. Once I restore the service file and reload it, it worked as expected.
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systemctl daemon-reload