Comment 3 for bug 1890406

Thanks for the feedback, Philipp.

I was able to further investigate this bug and found that the following upstream commit fixes it:

https://github.com/tmux/tmux/commit/54efe337993b5571728a09b247c7f39d493659a8

Given that this bug is affecting unattended-upgrade users, I'm raising its Importance and also tagging it as server-next.