I have not used Log4Perl nor do I use Moose any more. However, I use Role::Tiny and Moo, and when you apply a Role to an object manually, the object is reblessed into the resultant class, which will have a name something like 'Foo::Bar_WITH_Bar::Baz', so if your logger config is dependent on the class name, that could be the source of the problem.

Things I would think are "pertinent to the question":

• Does the same behaviour occur when you consume the role with with?
• Does the same behaviour occur when you apply the role elsewhere than in the BUILD sub? E.g. using after BUILD?
• Does the same behaviour occur when you create a minimalist test case?
• Does the same behaviour occur when using Role::Tiny::apply_roles_to_object?
• Does the same behaviour occur when testing with a role other than the Log4Perl one?

Hope this helps!