[BUG] Metadata missing for PathExpand

[zhanglei1949]

MATCH (p: PERSON{id: $personId}) -[k:KNOWS*1..4]-(f: PERSON {firstName: $firstName})
WHERE p <> f
with f AS f, length(k) as len
with f AS f, min(len) as distance
ORDER  BY distance ASC, f.lastName ASC, f.id ASC
LIMIT 20

For this query, the PathExpand operator is supposed to carry metadata info, mainly the edge types triplet.