Debugging RCPP with VS Code

I am trying to reproduce the example here to debug RCPP code with VS Code on Windows.

Here is my launch.json config:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Debug R Package",
      "type": "cppdbg",
      "request": "launch",
      "program": "C:/Users/<USER>/AppData/Local/Programs/R/R-4.2.1/bin/x64/R",
      "args": [
        "--vanilla",
        "-e",
        "devtools::test()"
      ],
      "stopAtEntry": false,
      "cwd": "${workspaceFolder}",
      "environment": [],
      "externalConsole": false,
      "MIMode": "gdb",
      "miDebuggerPath": "C:/msys64/ucrt64/bin/gdb.exe",
      "setupCommands": [
        {
          "description": "Enable pretty-printing for gdb",
          "text": "-enable-pretty-printing",
          "ignoreFailures": true
        },
      ],
      "preLaunchTask": "debug",
    }
  ]
}

Here is the c_cpp_properties.json config:

{
    "configurations": [
      {
        "name": "Win32",
        "includePath": [
          "${workspaceFolder}/**",
          "C:/rtools40/mingw64/include",
          "C:/rtools40/mingw64/include/c++/8.3.0",
          "C:/rtools40/mingw64/include/c++/8.3.0/x86_64-w64-mingw32",
          "C:/Users/<USER>/AppData/Local/Programs/R/R-4.2.1/include",
          "C:/Users/<USER>/AppData/Local/Programs/R/R-4.2.1/library/Rcpp/include",
          "C:/Users/<USER>/AppData/Local/Programs/R/R-4.2.1/library/RcppArmadillo/include"
        ],
        "defines": [
          "_DEBUG",
          "UNICODE",
          "_UNICODE"
        ],
        "windowsSdkVersion": "10.0.19041.0",
        "compilerPath": "C:/msys64/ucrt64/bin/g++.exe",
        "cStandard": "c11",
        "cppStandard": "c++17",
        "intelliSenseMode": "gcc-x64"
      }
    ],
    "version": 4
  }

But when I try to debug, the code executes but does not stop at breakpoints.

I have tried to put calc_sum(c(1, 2, 3)) in tools\test.R and change the launch config with:

"args": [
    "--vanilla",
    "-e",
    "devtools::load_all();source('tools/test.R)'"
],

but that does not work either, the debugger does not stop at breakpoints.

Any idea what I may be doing wrong?