Hi,
I can confirm the same issue, fresh install on brand new hardware.
the plugins are installed, but the skin is not updated to reflect the menu items.
2021:12:10-15:35:22: Plugin::get_plugin_confg: error reading /usr/local/directadmin/plugins/custombuild/plugin.conf: Unable to open /usr/local/directadmin/plugins/custombuild/plugin.conf for reading.<br>
Permission denied<br>
2021:12:10-15:38:45: ioctl can't find the server's ip address for eth0 : No such device
2021:12:10-15:39:15: Plugin::get_plugin_confg: error reading /usr/local/directadmin/plugins/csf/plugin.conf: Unable to open /usr/local/directadmin/plugins/csf/plugin.conf for reading.<br>
Permission denied<br>
2021:12:10-15:39:15: Plugin::get_plugin_confg: error reading /usr/local/directadmin/plugins/custombuild/plugin.conf: Unable to open /usr/local/directadmin/plugins/custombuild/plugin.conf for reading.<br>
Permission denied<br>
another issue seen on el8 is the network dev not configured properly, its looking for eth0.
2021:12:10-15:45:20: ioctl can't find the server's ip address for eth0 : No such device
2021:12:10-15:47:19: ioctl can't find the server's ip address for eth0 : No such device
2021:12:10-15:47:20: ioctl can't find the server's ip address for eth0 : No such device
2021:12:10-15:47:22: ioctl can't find the server's ip address for eth0 : No such device
this can be fixed by entering the correct device name in directadmin.conf to the entry
ethernet_dev=