The IconTemplate.png overrides my icons when I package my app

Description

I have the following code for my simple app:

const { menubar } = require("menubar");
const path = require("path");

const mb = menubar({
	browserWindow: {
		width: 420,
		height: 520,
	},
	icon: path.join(__dirname, "extraResources", "icon.png"),
	tooltip: "Tester",
});

This works perfectly in development, but when I package this with Electron Forge, my tray icon only shows the IconTemplate.png.

Steps to Reproduce the Problem

1. Use any icon for the tray
2. Package the app
3. The icon is using the IconTemplate.png file, not mine.

Expected Behaviour

My icon should appear in "production", not the default.

Specifications

• Menubar version: latest
• Platform: Mac + Windows
• Electron version: v28.2.1

Other information

My app is a plain HTML file.

Reproduce the issue by packaging the sample menubar app with Electron Forge, then inspect how the configured icon and IconTemplate.png are selected in the packaged application. Confirm the fix by checking that the supplied icon, rather than the default template, appears in production on the reported platforms.