[Bug] How to set the favicon

[chenyucheng0503]

Describe the bug

How does Fresh set every feed's favicon?
I use a custom feed generated by feedgen and set it's icon url, but it doesn't work and show blank favicon. But other feed are just fine.
So could you tell me how to custom the favicon, thx!

To Reproduce

just add the feed as normal.
and my costom feed xml look like

<feed xmlns="http://www.w3.org/2005/Atom">
  <id>https://www.xiaohongshu.com</id>
  <title>小红书关注流</title>
  <updated>2024-04-24T10:16:44.946056+00:00</updated>
  <link href="https://www.xiaohongshu.com/"/>
  <generator uri="https://lkiesow.github.io/python-feedgen" version="1.0.0">python-feedgen</generator>
  <logo>https://img.ixintu.com/upload/jpg/20210522/b466594a956f6023b62f5672c59a07dd_48198_800_800.jpg</logo>
  <subtitle>小红书关注作者的笔记</subtitle>
  <entry>

Expected behavior

No response

FreshRSS version

1.23.1

Environment information

• Database version: [e.g. Mysql 5.7, SQLite]
• PHP version: [e.g. PHP 8.1]
• Installation type: [e.g. Docker, Docker image source, git, Yunohost]
  -Web server type: [e.g. Apache, nginx]
• Device: [e.g. iPhone13]
• OS: [e.g. Ubuntu 22.04, Win10, MacOS14]
• Browser: [e.g. Firefox 124]

Additional context

No response