I think this is related to this:
At the moment 1.5.1 has not been marked as recommended, which means that when you do meteor create test you will be using the latest recommended version (1.5.0). However, the above post says that the packages will have been updated, but not the build. So, you could update your test:
cd test
meteor update --release 1.5.1
meteor
and/or run with the release flag:
cd test
meteor --release 1.5.1