Hardly a solution (more like turn it on and off again) and most likely overkill but here's what I did:

  rm -rf ~/.vscode*
  rm -rf ~/Library/Application\ Support/Code
  rm -rf ~/Library/Saved\ Application\ State/com.microsoft.VSCode.savedState
  rm -rf ~/Library/Preferences/com.microsoft.VSCode.helper.plist 
  rm -rf ~/Library/Preferences/com.microsoft.VSCode.plist 
  rm -rf ~/Library/Caches/com.microsoft.VSCode
  rm -rf ~/Library/Caches/com.microsoft.VSCode.ShipIt
  sudo rm -rf /Applications/Visual\ Studio\ Code.app

Reinstalled VScode and Code Runner.

The instead of messing with JSON directly. Just used default checkboxes

JSON output of this:

    {
    "code-runner.executorMap": {

        "javascript": "node",
        "java": "cd $dir && javac $fileName && java $fileNameWithoutExt",
        "c": "cd $dir && gcc $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "zig": "zig run",
        "cpp": "cd $dir && g++ $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "objective-c": "cd $dir && gcc -framework Cocoa $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "php": "php",
        "python": "python3 -u",
        "perl": "perl",
        "perl6": "perl6",
        "ruby": "ruby",
        "go": "go run",
        "lua": "lua",
        "groovy": "groovy",
        "powershell": "powershell -ExecutionPolicy ByPass -File",
        "bat": "cmd /c",
        "shellscript": "bash",
        "fsharp": "fsi",
        "csharp": "scriptcs",
        "vbscript": "cscript //Nologo",
        "typescript": "ts-node",
        "coffeescript": "coffee",
        "scala": "scala",
        "swift": "swift",
        "julia": "julia",
        "crystal": "crystal",
        "ocaml": "ocaml",
        "r": "Rscript",
        "applescript": "osascript",
        "clojure": "lein exec",
        "haxe": "haxe --cwd $dirWithoutTrailingSlash --run $fileNameWithoutExt",
        "rust": "cd $dir && rustc $fileName && $dir$fileNameWithoutExt",
        "racket": "racket",
        "scheme": "csi -script",
        "ahk": "autohotkey",
        "autoit": "autoit3",
        "dart": "dart",
        "pascal": "cd $dir && fpc $fileName && $dir$fileNameWithoutExt",
        "d": "cd $dir && dmd $fileName && $dir$fileNameWithoutExt",
        "haskell": "runghc",
        "nim": "nim compile --verbosity:0 --hints:off --run",
        "lisp": "sbcl --script",
        "kit": "kitc --run",
        "v": "v run",
        "sass": "sass --style expanded",
        "scss": "scss --style expanded",
        "less": "cd $dir && lessc $fileName $fileNameWithoutExt.css",
        "FortranFreeForm": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran-modern": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran_fixed-form": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "sml": "cd $dir && sml $fileName",
        "mojo": "mojo run",
        "erlang": "escript",
        "spwn": "spwn build",
        "pkl": "cd $dir && pkl eval -f yaml $fileName -o $fileNameWithoutExt.yaml",
        "gleam": "gleam run -m $fileNameWithoutExt"
    },
    "code-runner.clearPreviousOutput": true,
    "code-runner.showExecutionMessage": false
}