Cypher : UNWIND with nested list is broken `WithStep requires a previous step`

Hello,


Query : 


```CYPHER
WITH [[1, 2], [3, 4], []] AS nested
UNWIND nested AS x
UNWIND x AS y
RETURN count(y) AS total
```


Expected result : 

```text
4
```


Result instead : 

Error : `WithStep requires a previous step`


