subclass edges missing

[cbizon]

{
    "message": {
        "query_graph": {
            "nodes": {
                "disease": {
                    "ids": [
                        "MONDO:0018912"
                    ]
                },
                "chemical": {
                    "categories": [
                        "biolink:ChemicalEntity"
                    ]
                }
            },
            "edges": {
                "t_edge": {
                    "object": "disease",
                    "subject": "chemical",
                    "predicates": [
                        "biolink:treats"
                    ]
                }
            }
        }
    }
}

Running against strider in dev. Returns a bunch of results, and there are auxiliary graphs that look like this (coming I think from BTE):

"support0-PUBCHEM.COMPOUND:2145-treats-MONDO:0018912-via_subclass": {
                "edges": [      
                    "7d405b6fbef9", 
                    "a3ff48aa0ae1"  
                ],              
                "attributes": null
            },          

But there is no edge "a3ff48..." in the knowledge graph.