cross version entity failure

docker-compose.yaml

version: '3.7'
services:
  datastore:
    image: google/cloud-sdk:latest
    command:
      [
        'gcloud',
        'beta',
        'emulators',
        'datastore',
        'start',
        '--project=test',
        '--host-port=0.0.0.0:8500'
      ]
    ports:
      - 8500:8500
    healthcheck:
      test: ['CMD', 'curl', 'localhost:8500']
      interval: 3s
      retries: 5
      timeout: 15s
  app:
    image: node:20-slim
    environment:
      DATASTORE_EMULATOR_HOST: datastore:8500
    volumes:
      - ./:/app
    working_dir: /app
    depends_on:
      datastore:
        condition: service_healthy
    command:
      - /bin/sh
      - -c
      - 'yarn install && yarn run ts-node index.ts'

index.ts

import { Datastore as NewerDatastore } from "datastore-newer";
import { Datastore as OlderDatastore } from "datastore-older";

const datastore = new OlderDatastore({ projectId: "test" });

(async () => {
  const key = datastore.key("item");
  const data = {
    newDouble: NewerDatastore.double(1.1),
    oldDouble: OlderDatastore.double(2.2),
  };
  await datastore.save({ key, data });

  console.log(await datastore.get(key));
  /*
  output
  ---
  [
    {
      newDouble: { type: 'DatastoreDouble', value: 1.1 },
      oldDouble: 2.2,
      [Symbol(KEY)]: Key { namespace: undefined, id: '1', kind: 'item', path: [Getter] }
    }
  ]
   */
})();

package.json

{
  "name": "cross-version-entity",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "datastore-newer": "npm:@google-cloud/datastore@7.5.0",
    "datastore-older": "npm:@google-cloud/datastore@6.6.2",
    "ts-node": "^10.9.1",
    "typescript": "^5.0.4"
  }
}