Yes, I'm also running a clustered Seam 3 App with Persistence Module...
Marek Schmidt traced this issue
should be inside the web-fragment.xml inside Solder jar.
Not just Solder has this issue, Seam Servlet, Security, Remoting and Faces has it too.
Looks like they will be fixed on version 3.0.1.
Thanks Marek Schmidt,
Thomas Andraschko and Florian Hell