[bug] missing icon in waybar's hyprland/window module on fresh install

[nktnet1]

What happened?

This is what I see when opening Zen browser (missing icon):

I had expected to see icons similar to Firefox, Chrome or Edge:

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My waybar's hyprland/window module configuration is:

    "hyprland/window": {
        "icon": true,
        "icon-size": 18,
        "format": "{}",
        "max-length": 200,
        "separate-outputs": true
    },

Reproducible?

• [X] I have checked that this issue cannot be reproduced on Mozilla Firefox.

Version

Mozilla Zen 1.0.0-a.29

Severity impact

Low

What platform are you seeing the problem on?

Linux

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There is a Zen icon visible in wofi though:

[takase1121]

This might be relevant to #449 because Zen isn't correctly reporting it's WM class.