with blocks breaks exception causality chain (Throwable.cause)

[doublep]

To reproduce:

1. Run attached example (a simple Gradle-based project with only one Java file)

2. See the following output:

   1. Throwing directly
   Exception of type org.python.core.PyException (__builtin__.test$MyException: test$MyException: foo)
   Caused by exception of type test$MyException (__builtin__.test$MyException: test$MyException: foo)
   2. Throwing inside a context manager block
   Exception of type org.python.core.PyException (__builtin__.test$MyException: test$MyException: foo)
   

I would expect that exception in the second case is exactly the same, with the same cause. Yes, message and printed stacktrace looks fine, but from programming point of view it incorrectly lacks a cause (as in Throwable.getCause()).
jython.tar.gz