Unexpected scroll area in new window

Description

Everytime I open hyper, there would be a scroll area like this

I'm using Windows 10 wsl Arch Linux, and I found that this only occurs on the first tab of every new window.
If you open a new tab or split the tab, the new session looks alright.
and if I change the shell (zsh) to bash or powershell, everything works fine too. So I guess it is a matter of zsh.

Config and others

Hyper config

And here is my hyper config

// Future versions of Hyper may add additional config options,
// which will not automatically be merged into this file.
// See https://hyper.is#cfg for all currently supported options.

module.exports = {
  config: {
    // choose either `'stable'` for receiving highly polished,
    // or `'canary'` for less polished but more frequent updates
    updateChannel: 'stable',

    // default font size in pixels for all tabs
    fontSize: 14,

    // font family with optional fallbacks
    fontFamily: '"Sarasa Mono SC", Menlo, "DejaVu Sans Mono", Consolas, "Lucida Console", monospace',

    // default font weight: 'normal' or 'bold'
    fontWeight: 'normal',

    // font weight for bold characters: 'normal' or 'bold'
    fontWeightBold: 'bold',

    // line height as a relative unit
    lineHeight: 1,

    // letter spacing as a relative unit
    letterSpacing: 0,

    // terminal cursor background color and opacity (hex, rgb, hsl, hsv, hwb or cmyk)
    cursorColor: 'rgba(248,28,229,0.8)',

    // terminal text color under BLOCK cursor
    cursorAccentColor: '#000',

    // `'BEAM'` for |, `'UNDERLINE'` for _, `'BLOCK'` for █
    cursorShape: 'BLOCK',

    // set to `true` (without backticks and without quotes) for blinking cursor
    cursorBlink: false,

    // color of the text
    foregroundColor: '#fff',

    // terminal background color
    // opacity is only supported on macOS
    backgroundColor: '#000',

    // terminal selection color
    selectionColor: 'rgba(248,28,229,0.3)',

    // border color (window, tabs)
    borderColor: '#333',

    // custom CSS to embed in the main window
    css: '',

    // custom CSS to embed in the terminal window
    termCSS: '',

    // if you're using a Linux setup which show native menus, set to false
    // default: `true` on Linux, `true` on Windows, ignored on macOS
    showHamburgerMenu: '',

    // set to `false` (without backticks and without quotes) if you want to hide the minimize, maximize and close buttons
    // additionally, set to `'left'` if you want them on the left, like in Ubuntu
    // default: `true` (without backticks and without quotes) on Windows and Linux, ignored on macOS
    showWindowControls: '',

    // custom padding (CSS format, i.e.: `top right bottom left`)
    padding: '12px 14px',

    // the full list. if you're going to provide the full color palette,
    // including the 6 x 6 color cubes and the grayscale map, just provide
    // an array here instead of a color map object
    colors: {
      black: '#000000',
      red: '#C51E14',
      green: '#1DC121',
      yellow: '#C7C329',
      blue: '#0A2FC4',
      magenta: '#C839C5',
      cyan: '#20C5C6',
      white: '#C7C7C7',
      lightBlack: '#686868',
      lightRed: '#FD6F6B',
      lightGreen: '#67F86F',
      lightYellow: '#FFFA72',
      lightBlue: '#6A76FB',
      lightMagenta: '#FD7CFC',
      lightCyan: '#68FDFE',
      lightWhite: '#FFFFFF',
    },

    // the shell to run when spawning a new session (i.e. /usr/local/bin/fish)
    // if left empty, your system's login shell will be used by default
    //
    // Windows
    // - Make sure to use a full path if the binary name doesn't work
    // - Remove `--login` in shellArgs
    //
    // Bash on Windows
    // - Example: `C:\\Windows\\System32\\bash.exe`
    //
    // PowerShell on Windows
    // - Example: `C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\powershell.exe`
    shell: 'wsl.exe',

    // for setting shell arguments (i.e. for using interactive shellArgs: `['-i']`)
    // by default `['--login']` will be used
    shellArgs: ['~'],

    // for environment variables
    env: {},

    // set to `false` for no bell
    bell: 'SOUND',

    // if `true` (without backticks and without quotes), selected text will automatically be copied to the clipboard
    copyOnSelect: false,

    // if `true` (without backticks and without quotes), hyper will be set as the default protocol client for SSH
    defaultSSHApp: true,

    // if `true` (without backticks and without quotes), on right click selected text will be copied or pasted if no
    // selection is present (`true` by default on Windows and disables the context menu feature)
    quickEdit: false,

    // choose either `'vertical'`, if you want the column mode when Option key is hold during selection (Default)
    // or `'force'`, if you want to force selection regardless of whether the terminal is in mouse events mode
    // (inside tmux or vim with mouse mode enabled for example).
    macOptionSelectionMode: 'vertical',

    // URL to custom bell
    // bellSoundURL: 'http://example.com/bell.mp3',

    // Whether to use the WebGL renderer. Set it to false to use canvas-based
    // rendering (slower, but supports transparent backgrounds)
    webGLRenderer: true,

    // for advanced config flags please refer to https://hyper.is/#cfg
  },

  // a list of plugins to fetch and install from npm
  // format: [@org/]project[#version]
  // examples:
  //   `hyperpower`
  //   `@company/project`
  //   `project#1.0.1`
  plugins: [
    // "shades-of-purple-hyper"
  ],

  // in development, you can create a directory under
  // `~/.hyper_plugins/local/` and include it here
  // to load it and avoid it being `npm install`ed
  localPlugins: [],

  keymaps: {
    // Example
    // 'window:devtools': 'cmd+alt+o',
  },
};

Developer tool

And the console did not complain anything, this is the developer tool screenshot,

You can see the unexpected height 902px

My .zshrc (no comment)

export ZSH="/home/oopsy/.oh-my-zsh"

ZSH_THEME="pi"

plugins=(git vi-mode zsh-syntax-highlighting)

source $ZSH/oh-my-zsh.sh

Version

Hyper 3.0.2 (stable)
OS: Arch Linux on Windows 10 x86_64 19041.450

Thanks!

Start by reproducing the issue in Hyper 3.0.2 on Windows 10 WSL with the provided zsh configuration, then compare the first tab with bash or PowerShell and inspect the unexpected 902px height shown in the developer tools. Done means opening a new window with zsh no longer creates the unexpected scroll area.