Invalid debug adapter when setting "justMyCode": false

[zone-coba]

Scenario: debugging Python application running in Docker on remote host.

Debugging own code works fine. But as soon we set "justMyCode": false, in order to debug into 3rd party libs code, we get an error:

[error] Invalid debug adapter: Error: Invalid debug adapter

Cannot debug at all, container is running and listening at port, but not accessible.

Turning back to "justMyCode": true, debugging works again, but limited to application code.

Path mappings are triple-checked.

Steps to Reproduce

1. Open VS Code.

2. Set up the launch.json as follows:

   {
       "configurations": [
           // Docker-specific configurations (require Python & Docker extension)
           {
               "name": "Python Debugger: LM Service (in Docker)",
               "type": "docker",
               "request": "launch",
               "preLaunchTask": "docker-run: debug",
               "python": {
                   "pathMappings": [
                       {
                           // our custom code
                           "localRoot": "${workspaceFolder}",
                           "remoteRoot": "/app" // Corresponding path in Docker container
                       },
                       {
                           // 3rd-party libraries code (relevant when "justMyCode": false)
                           "localRoot": "${workspaceFolder}/.venv/lib/python3.12/site-packages/",
                           "remoteRoot": "/app/.venv/lib/python3.12/site-packages/" // Corresponding path in Docker container
                       }
                   ],
                   "projectType": "general",
                   "justMyCode": false, // <=== fails when set to false, fine for true
                   "subProcess": true,
                   "logToFile": true  // Enable verbose logging
               }
           }
       ]
   }

3. Start the debugger.

4. Observe the error message: [error] Error: Invalid debug adapter at vVt.p...

Expected Behavior

The debugger should start successfully with justMyCode set to false.

Versions

vscode is 1.96.2, involved extensions

• Python extension 2024.22.2
• Python Debugger extension 2024.14.0
• Docker extension 1.29.3
• Remote extension suite

all latest versions (as of today 10 JAN 2025)

Same behavior in Py 3.11 and 3.12.

Log

2025-01-10 12:07:56.778 [error] Invalid debug adapter: Error: Invalid debug adapter
    at vVt.p (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:748:95)
    at vVt.$acceptDAExit (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:748:35)
    at Odt.S (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3144:41680)
    at Odt.Q (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3144:41458)
    at Odt.M (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3144:40546)
    at Odt.L (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3144:39783)
    at oee.value (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:3144:38444)
    at x.B (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:30:748)
    at x.fire (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:30:967)
    at K6.fire (vscode-file://vscode-app/c:/Users/bell/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/workbench.desktop.main.js:762:10348)