ivy:buildlist task confused by extends feature using two parents

I'm finding that the ivy:buildlist Ant task is erroring when it encounters more than one parent Ivy module that's pulled in through the /ivy-module/info/extends element. This problem is new to Ivy 2.3.0-rc1; I did not encounter it with Ivy 2.2.0. There is no relationship or interaction between the two different parent Ivy modules, i.e. no nesting of parents.

In my test case, which I explain shortly, when I point the ivy:buildlist Ant task at a project stack that includes a mix of both parents and their children, I see this error:
...\multimodule-build\build.xml:28: impossible to parse ivy file for ...\testTwoParents\germany\build.xml: ivyfile=...\testTwoParents\germany\ivy.xml exception=java.text.ParseException: Problem occurred while parsing ivy file: inconsistent module descriptor file found in 'file:/.../testTwoParents/master-parent/ivy.xml': bad module name: expected='bootstrap-parent' found='master-parent'; in file:/.../testTwoParents/germany/ivy.xml

What's happening is, the germany module extends bootstrap-parent, but somehow the relative path to master-parent/ivy.xml is supplanting the relative path to bootstrap-parent/ivy.xml. It appears buildlist doesn't know how to deal with more than one parent.

This is what occurs when the haltOnError attribute is set to "true" on ivy:buildlist. If I set haltOnError="false" in my test case, the exception goes away, but I see the following build order:
1. germany
2. ireland
3. bootstrap-parent
4. master-parent
5. croatia

What's wrong about this build order is that germany depends on ireland and ireland depends on bootstrap-parent, so the order of the first three entries is reversed. If I removed the dependency of ireland on bootstrap-parent, the order would be the same. This misordering is clearly related to the presence of more than one parent because comparable tests using (A) the extends feature with a single parent and (B) no extends feature at all get the order right. Plus, I see this unexpected output when haltOnError="false":
[ivy:buildlist] => adding it at the beginning of the path
[ivy:buildlist] => adding it at the beginning of the path

TEST CASE INSTRUCTIONS:
I've attached a ZIP containing three standalone test cases, each consisting of a suite of Ant projects that together comprise a multimodule build whose build order is to be determined by the ivy:buildlist task:

• testNoParents: The extends feature is not used.
• testOneParent: The extends feature is used to pull in content from a single parent Ivy module.
• testTwoParents: The extends feature is used where one Ivy module pulls in content from one parent and two other Ivy modules pull in content from a different parent.

The testNoParents and testOneParent tests are the control groups. The testTwoParents test is where things fail.

When running Ant from one of these test cases, you need to specify the location of the Ivy 2.3.0-rc1 installation using one of the following:

• an IVY_DIR environment variable
• an env.IVY_DIR user property, i.e. -Denv.IVY_DIR=...
• an ivy.dir user property, i.e. -Divy.dir=...

To run the build in any of these suites, go to the multimodule-build directory, and execute "ant" or "ant init"—while specifying the Ivy installation location. You can also run "ant cleancache" to clear out the Ivy cache. However, you shouldn't need to do this regularly because each of these test cases uses its own dedicated Ivy cache.

NOTE: This issue is broached in the email thread "extends & buildlist on 2.3.0-rc1 … it gets worse" on the ivy-user and ant-dev mailing lists.