Using apt version 0.8.16~exp12ubuntu10.5 from precise-proposed I followed the test case in the bug description and observed the behavior expected from the package in proposed and no longer received the merge list error message.
Using apt version 0.8.16~ exp12ubuntu10. 5 from precise-proposed I followed the test case in the bug description and observed the behavior expected from the package in proposed and no longer received the merge list error message.