Changing the max-history attribute value for configuration-changes fails

[standalone@localhost:9990 /] /core-service=management/service=configuration-changes:write-attribute(name=max-history,value=20)
{
"outcome" => "failed",
"failure-description" => "WFLYCTL0158: Operation handler failed: java.lang.IllegalStateException: WFLYCTL0188: Stage MODEL is already complete",
"rolled-back" => true
}