Invalid characters in terminal after special characters were displayed during prebuild

Bug description

Invalid characters in terminal after special characters were displayed during prebuild.

In the screenshot above -
Aftermc (Minio client) was running during prebuild (these are the green characters),
A new workspace opens with invalid characters in terminal (ie. 11;rgb:1e1e/1e1e/1e1e;1R)

I'm sure it's not related specifically to mc, but has to do with special characters that are displayed during prebuild.
But mc was the easiest example I could find to reproduce the problem I'm seeing.

Steps to reproduce

1. Open the example repository in Gitpod - https://github.com/shaal/gitpod-test--invalid-characters-in-terminal
2. When workspace open - confirm you see invalid characters in terminal

Workspace affected

No response

Expected behavior

Regardless of what special characters are displayed during prebuild, it should not affect the terminal in a new workspace.
Especially when these invalid characters are "typed" in the command line.

Example repository

https://github.com/shaal/gitpod-test--invalid-characters-in-terminal

Anything else?

No response