vscode-python: Debugging stops working when the .env file has more than 556 characters

Environment data

• VS Code version: 1.22.2
• Extension version: 2018.3.1
• OS and version: Windows 7 64bits
• Python version: 3.6.5 64bits
• Type of virtual environment used: pipenv

Actual behavior

Debugging completely stops working when the .env file has more than 556 characters and does not display any error or log message. It’s necessary to restart the VSCode to work again if the .env file is less than 556 characters long (ignoring spaces).

Expected behavior

Debugging well…

Steps to reproduce:

1. Type more than 556 characters in .env file (sum of var names, values, etc).
2. Type F5 or click menu Debug>Start Debugging.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

NOTHING!

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help)

NOTHING!