[Bug]Steam on "Steam Families Beta" can't use Millennium

[aipiao-gh]

Before Reporting

• [X] I found no existing issues matching my bug
• [ ] My issue is not caused by the Millennium interface inside Steam (Themes, Plugins & Update Panel). If it is, make a issue report in this repo.
• [X] My issue is not caused by a theme

Describe the Bug

Steam Testing: Steam Families Beta Steam Version: 1722380543 Steam API Version: SteamClient021 Millennium Version: 2.9.4

Expected Behavior

Open Steam and it can work

Steps To Reproduce

1.install Millennium 2.can't start Steam

Operating System

Windows

Anything else?

No response