Here's the query and output of my Netsuite suiteQL query

Query:
SELECT * FROM PreviousTransactionLineLink ptll WHERE ptll.nextdoc = 5012317

Result:

[

  {

    "discount": "F",

    "foreignamount": null,

    "lastmodifieddate": "2021-08-26 15:43:14",

    "linktype": "DropShip",

    "nextdate": "2021-08-26 00:00:00",

    "nextdoc": 5012317,

    "nextline": 1,

    "nexttype": "PurchOrd",

    "previousdate": "2021-08-26 00:00:00",

    "previousdoc": 5012315,

    "previousline": 4,

    "previoustype": "SalesOrd"

  }

]

Yet, If I query

SELECT * FROM PreviousTransactionLineLink ptll WHERE ptll.nextdoc =5012317

AND ptll.nextline = 1

I get no results.

The only think that I added in the second query is AND ptll.nextline = 1

and there's definitely a row with that value as evidenced by the first query result.

Does anyone know why filtering by PreviousTransactionLineLink.nextline doesn't seem to work?