The Bug is in JoinTreeFactory, it was incorrectly detecting the end of building the Join tree (which is recursive). This would stop the join tree from being "fully formed".
For example... this query might not bring back the shipping address country.
find order join customerjoin customer.shippingAddress join customer.shippingAddress.country
... but would for billing address country.
find order join customerjoin customer.billingAddress join customer.billingAddress.country
The reason for the bug in this case is that would stop the building at shippingAddress country because it had already come across the country type before (in billingAddress country).
The fix: Remove the previous test and replace it with the more specific test to detect master/detail relationships and stop at that point. This is that the type and the grandparent type are the same.
Fixed in 0.9.5b.
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