koa-shopify-auth generates accessToken with 24 _expire timestamp

[find-replace]

Contrary to the docs, the code below always generates a short lived access token that changes every 24hrs. I've included accessMode: 'offline' even though that is supposedly the default.

Is there some restriction/setting I'm not aware of as to why I can generate an offline token?

Server.js

require('isomorphic-fetch')

const { Account } = require('./db.js')
const { ApiVersion } = require('@shopify/koa-shopify-graphql-proxy')
const { default: createShopifyAuth } = require('@shopify/koa-shopify-auth')
const { default: graphQLProxy } = require('@shopify/koa-shopify-graphql-proxy')
const { v4: uuidv4 } = require('uuid')
const { verifyRequest } = require('@shopify/koa-shopify-auth')
const dotenv = require('dotenv')
const Koa = require('koa')
const logger = require('koa-logger')
const next = require('next')
const session = require('koa-session')
const store = require('store-js')

dotenv.config()
const port = parseInt(process.env.PORT, 10) || 3000
const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

const { SHOPIFY_API_SECRET_KEY, SHOPIFY_API_KEY } = process.env

app.prepare().then(() => {
  const server = new Koa()

  server.use(logger())
  server.use(session({ secure: true, sameSite: 'none' }, server))
  server.keys = [SHOPIFY_API_SECRET_KEY]

  server.use(
    createShopifyAuth({
      apiKey: SHOPIFY_API_KEY,
      secret: SHOPIFY_API_SECRET_KEY,
      scopes: [
        'read_products',
        'read_inventory',
        'write_inventory',
        'read_locations',
      ],
      accessMode: 'offline',
      async afterAuth(ctx) {
        try {
          const { shop, accessToken, _expire } = ctx.session
          console.log('HERE', shop, accessToken, _expire)

Package.json

"dependencies": {
    "@shopify/app-bridge-react": "^1.24.0",
    "@shopify/koa-shopify-auth": "3.1.64",
    "@shopify/koa-shopify-graphql-proxy": "^4.0.1",
    "@shopify/polaris": "^4.26.1",
    "@zeit/next-css": "^1.0.1",
    "apollo-boost": "^0.4.9",
    "dotenv": "^8.2.0",
    "graphql": "^15.1.0",
    "isomorphic-fetch": "^2.2.1",
    "js-cookie": "^2.2.1",
    "koa": "^2.13.0",
    "koa-logger": "^3.2.1",
    "koa-session": "^6.0.0",
    "mysql2": "^2.1.0",
    "next": "^9.4.4",
    "qrcode.react": "^1.0.0",
    "react": "^16.13.1",
    "react-apollo": "^3.1.5",
    "react-dom": "^16.13.1",
    "sequelize": "^5.21.13",
    "store-js": "^2.0.4",
    "uuid": "^8.1.0"
  },