When a ENUM tag in the annotated ACeDB models is marked with a hash-model (e.g #Evidence), the data is not migrated since the ENUM will result in an ident, which is not a referenable construct (in it's own right) in datomic (i.e it is a :db.type/keyword not a :db.type/ref)
The example cited that @a8wright ran into recently was :molecule.biofunction-role/value, whose annotated source is here,
The result (datomic entity api usage shown below in a clojure REPL session):
pseudoace.cli=> (->> mol :molecule/biofunction-role (map d/touch)
#_=> )
({:db/id 12134210419605054, :molecule.biofunction-role/value :molecule.biofunction-role.value/metabolite, :molecule.biofunction-role/text "Paper_evidence"})