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tmux inside an AWS SSM session forces white cursor #18695

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tmux inside an AWS SSM session forces white cursor#18695
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Issue-BugIt either shouldn't be doing this or needs an investigation.Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meeting
@NicosGollan-cnic

Description

@NicosGollan-cnic
NicosGollan-cnic
opened on Mar 17, 2025

Windows Terminal version

1.21.10351.0

Windows build number

10.0.26100.0

Other Software

gossm v1.5.0
tmux 3.0a
ubuntu 20.04, 22.04, 24.04

Steps to reproduce

  • Inside a WSL Linux session in Terminal (Ubuntu)
  • Connect to an AWS EC2 instance running Ubuntu 20.04
    Image
  • Start a tmux session
    Image

Expected Behavior

I expect the cursor colour to remain the same. Normally, I have a dark blue cursor on a light background.

Actual Behavior

The cursor is forced to pure white when starting or terminating the tmux session.

Opening Terminal settings and saving them without any changes restores the cursor to the intended colour, and it remains that way for the remainder of the tmux session.

This does not happen when running tmux "natively" in the "parent" WSL terminal, so far I only encountered the behaviour when running tmux in an SSM session.

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    Issue-BugIt either shouldn't be doing this or needs an investigation.Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meeting

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