Dropdown not work

[ZgblKylin]

Same bug occurs in browsh.

As the picture below, drop down list only shows background with no content texts, and mouse selection does not work.

For comparison, here's same drop down in same page with w3m:

Here's source html of the drop down list:

<div class="form">
<form method="POST" action="/confirm">
    <h1>XXXXX integration</h1>
    <label for="tags">Select xxxxx version</label>
    <select id="tags" name="tags" class="form-control form-control-sm">
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Axxxxxx">Axxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Vxxxxxx">Vxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Cxxxxxx">Cxxxxxx</option>
        <option value="Sxxxxxx">Sxxxxxx</option>
        <option value="Txxxxxx">Txxxxxx</option>
    </select>

[pachpict]

Also noticed this behaviour.