Recent bug reports in Weld (WELD-996, WELD-997) indicate that these parts of the specification are not tested well enough by the TCK. Please improve test coverage in this area. Tests for the issues mentioned above are written to be portable thus can be reused in the TCK:

org.jboss.weld.tests.interceptors.extension.CustomInterceptorRegistrationTest.testCustomInterceptorRegistration()
org.jboss.weld.tests.interceptors.extension.CustomInterceptorInvocationTest.testCustomInterceptorInvocation()