When a PositionedStoreStream is created on top of a stream from store, it must properly initialize itself.
Proper initialization consists of initializing and resetting the stream to make sure the states of the streams are in sync.
A case of out of sync stream states was detected in a test where the Clob reference wasn't kept, but a new Clob object was created for each operation, i.e:
A symptom of out of sync stream states is EOFException on a valid request.
I don't think the access style above is supposed to work, but the proper initialization should be performed anyway.