pythonnet: Cannot access indexer from .NET derived class

If you create a .NET base class that has an indexer, and then create a .NET derived class, that derived class used in Python cannot access the indexer. You can access existing properties though just fine.

import clr

clr.AddReference("PythonTest")

import PythonTest

a = PythonTest.IndexerBase()
b = PythonTest.Indexer()

print("count of items from base class: %i" % a.Count)
print("count of items from derived class: %i" % b.Count)
print("printing base class value: %s" % a[1])
print("printing derived class value: %s" % b[1]) #ERROR HERE

PythonTest Library.zip