Edge queries no longer visualize

[ericfe-google]

Repro:

%%spanner_graph --project google.com:ericfe-test --instance test-instance --database example-db

GRAPH FinGraph
MATCH
(account_1:Account)-[transfer:Transfers]-(account_2:Account)
RETURN
TO_JSON(transfer) AS c1

Expected: edges are visible as lines in the visualizer
Actual: only tabular view is visible.