Download of binary packages broken in BRMS 5.3 due to javax.jcr.RepositoryException

Issue

From time to time, we can see this log file output on our production system:

ERROR [org.drools.repository.PackageItem]  file backing binary value not found
javax.jcr.RepositoryException: file backing binary value not found
        at org.apache.jackrabbit.core.value.BLOBInTempFile.getStream(BLOBInTempFile.java:140)
        at org.drools.repository.PackageItem.getCompiledPackageBytes(PackageItem.java:1108)
        at org.drools.guvnor.server.jaxrs.PackageResource.getPackageBinary(PackageResource.java:278)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

This is accompanied by some malfunction, ie. the Business Center Servers REST call not returning the complete list of available process definitions.

As far as I understand, Jackrabbit which is used by Guvnor stores some backing data in the local /tmp directory. I guess this is where the problem comes from. Question: Where in the BRMS configuration can I control the target directory for this temporary backing files?