if relative-to="jboss.server.log.dir" then it it not pohysically written to the configuration. The setup still works as expected, because the server uses the default value anyhow.

reproduce:

# add the access-log entry
/subsystem=web/virtual-server=default-host/configuration=access-log:add

# set both path and relative-to
/subsystem=web/virtual-server=default-host/configuration=access-log/setting=directory:add(path=".",relative-to="jboss.server.log.dir")

# use the CLI to read the actual config:

/subsystem=web/virtual-server=default-host/configuration=access-log/setting=directory:read-resource
{
    "outcome" => "success",
    "result" => {
        "path" => ".",
        "relative-to" => "jboss.server.log.dir"
    },

in xml:

            <virtual-server name="default-host" enable-welcome-root="true">
                <alias name="localhost"/>
                <alias name="example.com"/>
                <access-log>
                    <directory path="."/>
                </access-log>
            </virtual-server>

Note that "relative-to" is not present in xml.

Expectation: that the value is written to xml regardless

Note that using for example a named path, and setting relative-to to that named path, the relative-to is correctly written.

Either way, the server works as expected as the default value is used when not present