wallet_requestSnaps always show install dialog in different localhost sites

[huweihong]

I create two site A and site B in localhost. In site A, I have installed snap A(running in 8080). The snap's config is:

{
  "version": "0.1.0",
  "description": "SnapA",
  "proposedName": "SnapA",
  "repository": {
    "type": "git",
    "url": "https://github.com/MetaMask/template-snap-monorepo.git"
  },
  "source": {
    "shasum": "63qRiHOi37RFs/GvzuscNwJ3wmyzz16bpckmJM7VUqI=",
    "location": {
      "npm": {
        "filePath": "dist/bundle.js",
        "packageName": "snap-a",
        "registry": "https://registry.npmjs.org/",
        "iconPath": "images/logo.svg"
      }
    }
  },
  "initialPermissions": {
    "snap_dialog": {},
    "endowment:rpc": {
      "dapps": true,
      "snaps": true
    },
    "snap_manageState": {},
    "endowment:network-access": {},
    "endowment:page-home": {},
    "endowment:ethereum-provider": {},
    "endowment:cronjob": {
      "jobs": [
        {
          "expression": "*/10 * * * * *",
          "request": {
            "method": "alert"
          }
        }
      ]
    }
  },
  "manifestVersion": "0.1"
}

And in site B, I used wallet_requestSnaps to request permission to connect to the snap A, there is always an install dialog to install snap A.

const snap = await request({
  method: 'wallet_requestSnaps',
  params: {
    'local:http://localhost:8080': {},
  },
});