The BizTalk Adapter for WebSphere MQ (MQSC Adapter) fails when the MQRFH2 header is passed. Additionally, the BizTalk host instance fails.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative update for Host Integration Server:
Learn about the terminology that Microsoft uses to describe software updates.