mongodb-memory-server: postinstall not working in npm 7.x

Versions

• NodeJS: 14.16.0
• npm: 7.8.0
• mongodb-memory-server: 6.9.6
• system: MacOS

package: mongo-memory-server

What is the Problem?

No binaries of mongodb are downloaded on npm install. Setting"disablePostinstall": "0" in the packege.json makes no difference

My package.json (striped):

{
  "name": "***",
  "version": "0.0.1",
  "description": "",
  "author": "",
  "private": true,
  "license": "UNLICENSED",
  "scripts": {
  },
  "config": {
    "mongodbMemoryServer": {
      "version": "4.4.5",
      "debug": "1"
    }
  },
  "dependencies": {
    "@nestjs/common": "^7.6.15",
    "@nestjs/core": "^7.6.15",
    "@nestjs/graphql": "^7.10.3",
    "@nestjs/mapped-types": "*",
    "@nestjs/mongoose": "^7.2.4",
    "@nestjs/platform-express": "^7.6.15",
    "apollo-server-express": "^2.22.2",
    "graphql": "^15.5.0",
    "graphql-tools": "^4.0.8",
    "lodash": "^4.17.21",
    "mongoose": "^5.12.3",
    "reflect-metadata": "^0.1.13",
    "rimraf": "^3.0.2",
    "rxjs": "^6.6.6"
  },
  "devDependencies": {
    "@nestjs/cli": "^7.6.0",
    "@nestjs/schematics": "^7.3.0",
    "@nestjs/testing": "^7.6.15",
    "@types/express": "^4.17.11",
    "@types/jest": "^26.0.22",
    "@types/node": "^14.14.36",
    "@types/supertest": "^2.0.10",
    "@typescript-eslint/eslint-plugin": "^4.19.0",
    "@typescript-eslint/parser": "^4.19.0",
    "eslint": "^7.22.0",
    "eslint-config-prettier": "^8.1.0",
    "eslint-plugin-prettier": "^3.3.1",
    "jest": "^26.6.3",
    "mongodb-memory-server": "^6.9.6",
    "prettier": "^2.2.1",
    "supertest": "^6.1.3",
    "ts-jest": "^26.5.4",
    "ts-loader": "^8.0.18",
    "ts-node": "^9.1.1",
    "tsconfig-paths": "^3.9.0",
    "typescript": "^4.2.3"
  },
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": ".*\\.spec\\.ts$",
    "transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },
    "collectCoverageFrom": [
      "**/*.(t|j)s"
    ],
    "coverageDirectory": "../coverage",
    "testEnvironment": "node"
  }
}

Do you know why it happenes?

no