No tcpmux connections are shown in Web UI

[gecube]

Bug Description

As a DevOps engineer I want to see the tcpmux connected instances in separate UI panel. Right now I can see only HTTP ones:

It proves that the client is connected and connection is persistent.

The TCP section is empty.

frpc Version

v0.56.0

frps Version

v0.56.0

System Architecture

linux/arm64

Configurations

frpc.ini

serverAddr = "**.**.**.**"
serverPort = 7000

[[proxies]]
name = "ssh-edge031"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["edge-031"]
localIP = "127.0.0.1"
localPort = 22

Logs

No response

Steps to reproduce

No response

Affected area

• [ ] Docs
• [ ] Installation
• [ ] Performance and Scalability
• [ ] Security
• [X] User Experience
• [ ] Test and Release
• [ ] Developer Infrastructure
• [ ] Client Plugin
• [ ] Server Plugin
• [ ] Extensions
• [ ] Others