Erl Wood Fingerprint Similarity output column is deleted in a multiple chain workflow

Hi,

   I've noticed that if I run a Tanimoto comparison in an Erlwood Fingerprint Similarity node, it creates a default output column 'Tanimoto', or allows you to custom name it.  This is fine for one node.  However, if I create a chain with multiple such nodes, the output column from prior Fingerprint Similarity nodes are deleted.

I've included a simple workflow that demonstrates the issue.

Regards,

--George