Hi I'm trying to do something very similar in Odoo 18.0 upgrading from Odoo 17.0. Have you had any issues with this?

I have this in my manifest:
web.assets_backend:
'web.assets_backend': [
'my_module/static/src/scss/**',
'my_module/static/src/xml/**'
],
'web_editor.backend_assets_wysiwyg': [
'my_module/static/src/js/wysiwyg.js',
],

And this is my wysiwyg.js file:

/** @odoo-module **/
import { Wysiwyg } from '@web_editor/js/wysiwyg/wysiwyg';
import { patch } from '@web/core/utils/patch';
import { _t } from '@web/core/l10n/translation';
import {parseHTML} from '@web_editor/js/editor/odoo-editor/src/utils/utils'

patch(Wysiwyg.prototype, {
_getPowerboxOptions() {
const options = super._getPowerboxOptions();
const wysiwyg = this

options.commands.push({
category: _t('Widgets'),
name: _t('10 Stars'),
priority: 5,
description: _t('Insert a rating over 10 stars'),
fontawesome: 'fa-star',
callback: function () {
let html = '\u200B<span contenteditable="false" class="o_stars o_ten_stars">';
html += Array(10).fill().map(() => '<i class="fa fa-star-o"></i>').join('');
html += '</span>\u200B';
wysiwyg.odooEditor.execCommand('insert', parseHTML(window.document, html));
},
});
return options;
},
});

It works perfectly in Odoo 17.0, but in Odoo 18.0 the modules aren't even loading at all. I can't even see console logs. I've tried it on other browsers, other computers, clearing cache, regenerating assets, restarting odoo http. Can't seem to get anything to load using the web_editor.backend_assets_wysiwyg bundle