Optional Match not work

[LianxinGao]

reference: https://neo4j.com/docs/cypher-manual/current/clauses/optional-match/

match (x) where x.name = 'AAA' 
optional match (n) where n.name='AAaA' 
return x, n

if optional match doesn't match any data, x match 1 data, the result should be:

╒═════════════════════╤════╕
│"x" │"n" │
╞═════════════════════╪════╡
│{"name":"AAA","id":1}│null│
└─────────────────────┴────┘