I've uploaded a patch for this issue. I'm not sure how to test all possible execution paths in resolveAccessible() without defining a bunch of new classes just for this purpose. I've marked this as a TODO.
Woops, I've just noticed, that the first version of my patch does not contain a test bean class I've written. Please use v2.
ExceptionBean is a class I've used for the test cases for SANDBOX-423 but it is useful for methods registry tests also. It defines some methods with protected, private and package visibility to test exception handling in cases, when methods are not accessible to the BU2 code.