vscode: The Ctrl+R in integrated ZSH terminal does not open `bck-i-search`

• VSCode Version: 1.50.1
• OS Version: Darwin x64 19.6.0 / MacOS Catalina 10.15.7

Steps to Reproduce:

1. Open integrated terminal
2. Press Ctrl+R

Does this issue occur when all extensions are disabled?: Yes

My settings:

{
  "editor.accessibilitySupport": "off",
  "editor.fontFamily": "Fira Code",
  "editor.fontLigatures": true,
  "[javascript]": {
    "editor.formatOnSave": true
  },
  "[typescript]": {
    "editor.formatOnSave": true
  },
  "editor.tabSize": 2,
  "editor.parameterHints.enabled": false,
  "editor.acceptSuggestionOnCommitCharacter": false,
  "editor.quickSuggestionsDelay": 10,
  "editor.wordBasedSuggestions": false,
  "editor.acceptSuggestionOnEnter": "on",
  "editor.quickSuggestions": {
    "other": false,
    "comments": false,
    "strings": false
  },
  "files.insertFinalNewline": true,
  "javascript.implicitProjectConfig.checkJs": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "editor.formatOnSave": true,
  "window.autoDetectColorScheme": true,
  "terminal.integrated.macOptionIsMeta": true,
  "terminal.integrated.allowChords": false,
  "terminal.integrated.shell.osx": "/bin/zsh",
  "workbench.colorTheme": "Default Light+"
}