This property is defined to take an 'instance' of evidence, but bound to an EvidenceType class which is defined to hold evidence codes (e.g. ECO terms). In my experience, it is used to hold ECO curies in data.

Propose to rename a has evidence of type to clarify this intended us, and update the description accordingly. If there is a need for an association slot that connects to an "instance of evidence", this should be a separate slot.