Engintron is the best Nginx related product for CPanel. I would like to show you the solution if you encounter a similar problem.

When installing Engintron on CL8-9, you may have an old version of Nginx installed.
You can check via the command line

nginx -v

Most likely the version will be 1.20
Below I offer a solution.

############################### Start #################################

rm -r /etc/yum.repos.d/nginx.repo
cat <<EOF > /etc/yum.repos.d/nginx.repo
[nginx]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true
priority=1
EOF

chattr +i /etc/yum.repos.d/nginx.repo
cp -r /etc/nginx /etc/nginx.bck
dnf erase nginx -y
rm -rf /etc/nginx

After which you can log into Engintron and run the command
(Update (or re-install) Engintron [with Nginx "stable"] )
When the process is completed, check the nginx version.
nginx -V
nginx version: nginx/1.24.0
If the version is 1.24 and higher, then you succeeded!