infiniteQuery always undefined cursor

export const execTaskGetLogs = webProcedure
  .input(
    z.object({
      execTaskId: z.string().nonempty(),
      debug: z.boolean().optional(),
      cursor: z.string().nullish(),
    })
  )
  .query(async ({ ctx, input: { execTaskId, debug, cursor } }) => {
       ...
       console.log('getLogs input: ', { execTaskId, debug, cursor })
       return { logs: [...], nextCursor: `<my-cursor>` }
  }

  const liveLogsQuery = trpc.execTask.getLogs.useInfiniteQuery(
    {
      execTaskId: execTaskResult.execTask.id,
      debug: execTaskResult.isAdmin,
    },
    {
      keepPreviousData: true,
      getNextPageParam: (lastPage) => {
        console.log('getNextPageParams: ', lastPage)
        return lastPage.nextCursor
      },
      refetchInterval: 3000,
    }
  )

🟩 WEB [query: execTask.getLogs]
getLogs input:  {
  execTaskId: 'clj7bs90q001ayu4ix356rtll',
  debug: false,
  cursor: undefined
}
🟩 WEB [query: execTask.getLogs]
getLogs input:  {
  execTaskId: 'clj7bs90q001ayu4ix356rtll',
  debug: false,
  cursor: undefined
}