Powerline: Segmentos de casca "acima da direita" se alinham à esquerda na configuração de várias linhas

Estou executando o Powerline com peixes do tmux. Tentei configurar um prompt de shell de várias linhas e recebi o seguinte comportamento no fish e no zsh:

Ainda não tentei reproduzir em uma VM, portanto, se houver algo óbvio que estou fazendo de errado, indique-o.

Se ajudar, aqui está o resultado de env $POWERLINE_COMMAND shell right | xxd :

00000000: 1b5b 306d                                .[0m

E aqui estão os avisos de peixes:

$ type fish_prompt                                                                                                                        
fish_prompt is a function with definition
function fish_prompt
    env $POWERLINE_COMMAND shell aboveleft --last-exit-code=$status --last-pipe-status=$status --jobnum=(jobs -p | wc -l) --renderer-arg=client_id=12917 --width=$_POWERLINE_COLUMNS --renderer-arg=mode=$fish_bind_mode --renderer-arg=default_mode=$_POWERLINE_DEFAULT_MODE
end
$ type fish_right_prompt                                                                                                                  
fish_right_prompt is a function with definition
function fish_right_prompt
    env $POWERLINE_COMMAND shell right --last-exit-code=$status --last-pipe-status=$status --jobnum=(jobs -p | wc -l) --renderer-arg=client_id=12917 --width=$_POWERLINE_COLUMNS --renderer-arg=mode=$fish_bind_mode --renderer-arg=default_mode=$_POWERLINE_DEFAULT_MODE
    echo -n " "
end

~/.config/powerline/themes/shell/default.json :

{
    "segments": {
        "above": [
            {
                "left": [
                    {
                        "function": "powerline.segments.common.net.hostname",
                        "priority": 10
                    },
                    {
                        "function": "powerline.segments.common.env.user",
                        "priority": 30
                    },
                    {
                        "function": "powerline.segments.shell.cwd",
                        "priority": 10
                    },
                    {
                        "function": "powerline.segments.shell.jobnum",
                        "priority": 20
                    }
                ],
                "right": [
                    {
                        "function": "powerline_gitstatus.gitstatus",
                        "priority": 40
                    },
                    {
                        "function": "powerline.segments.common.time.date",
                        "name": "time",
                        "args": {
                            "format": "%H:%M:%S",
                            "istime": true
                        }
                    },
                    {
                        "function": "powerline.segments.shell.last_pipe_status",
                        "priority": 10
                    },
                    {
                        "function": "powerline.segments.common.env.virtualenv",
                        "priority": 50
                    }
                ]
            }
        ],
        "left": [
            {
                "function": "powerline.segments.shell.mode"
            },
            {
                "function": "powerline.segments.shell.last_pipe_status",
                "priority": 10
            },
            {
                "function": "powerline.segments.common.time.date",
                "args": {
                    "format": "$"
                }
            }
        ],
        "right": [
        ]
    }
}

~/.tmux.conf :

set -g default-terminal "screen-256color"
POWERLINE_CONFIG_PATHS="$HOME/.config/powerline"
run-shell "powerline-daemon -q"
source "/usr/lib/python3.5/site-packages/powerline/bindings/tmux/powerline.conf"

config.fish mínimo:

set -gx POWERLINE_CONFIG_PATHS "$HOME/.config/powerline"

set fish_function_path $fish_function_path "/usr/lib/python3.5/site-packages/powerline/bindings/fish"
powerline-setup

source /usr/share/fish/functions/fzf.fish

.zshrc mínimo:

HYPHEN_INSENSITIVE="true"
DISABLE_AUTO_UPDATE="true"

if [[ -r /usr/lib/python3.5/site-packages/powerline/bindings/zsh/powerline.zsh ]]; then
    source /usr/lib/python3.5/site-packages/powerline/bindings/zsh/powerline.zsh
fi

Casca: fish v2.3.1 , zsh 5.2
Python: 3.5.2
SO: Manjaro (derivado do Arch Linux)

$ pip show powerline-status

---
Metadata-Version: 1.1
Name: powerline-status
Version: 2.4
Summary: The ultimate statusline/prompt utility.
Home-page: https://github.com/powerline/powerline
Author: Kim Silkebaekken
Author-email: [email protected]
License: MIT
Location: /usr/lib/python3.5/site-packages
Requires: 
Classifiers:
  Development Status :: 5 - Production/Stable
  Environment :: Console
  Environment :: Plugins
  Intended Audience :: End Users/Desktop
  License :: OSI Approved :: MIT License
  Natural Language :: English
  Operating System :: Microsoft :: Windows
  Operating System :: POSIX
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3.2
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: Implementation :: CPython
  Programming Language :: Python :: Implementation :: PyPy