Spurious OSC 11 when using tmux over Windows' SSH

[lhecker]

Windows Terminal version

1.23.2771.0

Windows build number

10.0.26100.0

Other Software

• OpenSSH_for_Windows_9.5p1, LibreSSL 3.8.2
• tmux 3.5a

Steps to reproduce

• Either
  • ssh to a Linux box
  • ssh to WSL (you can get the WSL2 VM IP by running e.g. ip a inside WSL)
• Run tmux

Expected Behavior

Welcome to fish, the friendly interactive shell
Type help for instructions on how to use fish
lhecker@server ~>

Actual Behavior

Welcome to fish, the friendly interactive shell
Type help for instructions on how to use fish
lhecker@server ~> ]11;rgb:0000/0000/0000\

The issue does not occur when ssh'ing to localhost inside WSL.