Arbitrary characters are missed from the output. See github issue https://github.com/tmux/tmux/issues/594 Fixed with commit https://github.com/tmux/tmux/commit/c2f88373e76b8c62ac2e2baed6bc1f0f20036401 Works in 2.4 and newer
I faced the same problem, so I created a pull request based on the comments, maybe someone could merge it. https://github.com/gentoo/gentoo/pull/6596
I think we'd better stablize tmux-2.6 than fix the old tmux-2.3.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=db7583610d5078d645d7f55ca80b181763c43273 commit db7583610d5078d645d7f55ca80b181763c43273 Author: Juanjie Xi <strangemk3@gmail.com> AuthorDate: 2017-12-22 02:09:18 +0000 Commit: Patrice Clement <monsieurp@gentoo.org> CommitDate: 2018-01-26 21:47:58 +0000 app-misc/tmux: add patch against the pipe-pane unreliable bug. Closes: https://bugs.gentoo.org/640228 Closes: https://github.com/gentoo/gentoo/pull/6596 Package-Manager: Portage-2.3.13 app-misc/tmux/files/tmux-2.3-pipe_pane-fix.patch | 9 +++ app-misc/tmux/tmux-2.3-r2.ebuild | 91 ++++++++++++++++++++++++ 2 files changed, 100 insertions(+)