Issue while batching list of text string

Hi Team,

Im trying a batch list of text items and prepare a query based on that. Below is my code snippet. With this code Im getting the last item of each list for the full batch of 50 items.

local!getAgreementIds: if(
    rule!APN_isBlank(
      index(
        index(local!PartnersResult, "data", null),
        "agreement__cr.id",
        null
      )
    ),
    index(
      local!AgreementResult.data,
      "agreement__cr.id",
      null
    ),
    index(
      local!PartnersResult.data,
      "agreement__cr.id",
      null
    )
  ),
  local!agreementDocIds: touniformstring(rule!APN_distinct(local!getAgreementIds)),
  
  local!batchedDocIds: a!forEach(
    items: enumerate(ceiling(length(local!agreementDocIds) / 50)),
    expression: local!agreementDocIds[
      (fv!item * 50) + 1 :
      min((fv!item + 1) * 50, length(local!agreementDocIds))
    ]
  ),

For ex: I have a list of 59 items, when I try to batch I should get 50 items in 1 batch and remaining 9 items in another batch. But Im getting last item of each batch that is 50th item in first batch and 59th item in 2nd batch. Can someone please help