[Bug] Element with ID is missing (when it actually exists) in NW.js environment

I'm encountering what seems like a bug trying to use EditorJS in an NW.js environment, whereby it can't seem to "see" the designated editor div on the DOM (it claims "element with ID «editorjs» is missing. Pass correct holder's ID").

Steps to reproduce:
Fire up an NW.js instance using the following example:

./package.json:
```json
{
"name": "Test",
"description": "Test EditorJS",
"main": "html/editor.html",
"window": {
"width": 1024,
"height": 768
},
"dependencies": {
"@editorjs/editorjs": "^2.19.1"
}
}
```

./js/main.js:
```javascript

let EditorJS = require ('@editorjs/editorjs');

document.addEventListener('DOMContentLoaded', (event) => {
const editor = new EditorJS('editorjs');
editor.isReady
.then(() => {
console.log('Editor.js is ready to work!')
})
.catch((reason) => {
console.log(`Editor.js initialization failed because of ${reason}`)
});
})
```

./html/editor.html:
```html

Expected behavior:
Editor.JS picks up the designated element and initialises as expected

Actual behavior:
```Editor.js initialization failed because of Error: element with ID «editorjs» is missing. Pass correct holder's ID.```

Environment:
Windows 10 v2004 (19041.804)
NW.js process.versions:
```json
ares: "1.17.1"
brotli: "1.0.9"
chromium: "88.0.4324.150"
icu: "68.1"
llhttp: "2.1.3"
modules: "88"
napi: "7"
nghttp2: "1.42.0"
node: "15.8.0"
node-webkit: "0.51.1"
nw: "0.51.1"
nw-commit-id: "b189fb7-0a4c564-9c3b184-5a47eef"
nw-flavor: "sdk"
openssl: "1.1.1i"
unicode: "13.0"
uv: "1.40.0"
v8: "8.8.278.15"
zlib: "1.2.11"
```

Editor.js version: 2.19.1