Why am I losing data when using my custom disassembler pipeline component?

Did you close the incoming data stream?

When you write custom disassembler code for pipeline components in BizTalk Server 2006, ensure that you do not close the incoming data stream in the disassembler code. The incoming stream from the input message is a shared resource and is used by the message-body tracking component in the BizTalk Server 2006 Messaging engine.

If you either implicitly or explicitly close the incoming stream, tracking data may be lost and you will be unable to examine the stream data in the Health and Activity Tracking (HAT) tool in BizTalk Server 2006.

Source: Microsoft