@idanwork's testcase for reproducing https://github.com/electron/electron/issues/27303

main.js

const { app, BrowserWindow } = require('electron')

function createWindow () {
  const win = new BrowserWindow({
    icon: undefined // "/Applications/Visual Studio Code.app/Contents/Resources/Code.icns", // <-- comment to avoid crash, or use electron 11.1.1
    /**
     * Jan 13 13:44:22  Electron Helper[26232] <Error>: read failed
       Jan 13 13:44:22  Electron Helper[26232] <Error>: SeatbeltExecServer: failed to read buffer length.
       Failed to initialize sandbox.
       /Users/idanwork/Projects/electron-icon/node_modules/electron/dist/Electron.app/Contents/MacOS/Electron exited with signal SIGSEGV
     */
   // icon: `${__dirname}/Code.icns`, // Tried to copy the icon locally, didn't help
  })

  win.loadURL('https://www.electronjs.org/docs/api/browser-window');
}

app.whenReady().then(createWindow)
app.on('window-all-closed', () => app.quit())
app.on('activate', () => BrowserWindow.getAllWindows().length === 0 && createWindow());

package.json

{
  "name": "electron-icon",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "run": "electron ."
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "scripts": {
    "start": "electron main.js"
  },
  "devDependencies": {
    "electron": "11.1.0"
  }
}