he HandlerOperations.equalValue() method uses the incorrect property name when comparing values resulting in the method always returning false.
This does not harm anything, but just changes the format pattern each time a resource is processed.
This fix is already upstream as part of https://bugzilla.redhat.com/show_bug.cgi?id=994661. The bug was introduced in the original WildFly commit which implemented the custom-formatter. Since the commit had to be ported rather than cherry-picked I just fixed it as part of the port.