Black won't trim two lines at end of file

[hochreitercorpuls]

Environment data

• VS Code version: 1.50.1
• Extension version (available under the Extensions sidebar): 2020.10.332292344
• OS and version: Windows 10 19042.572
• Python version (& distribution if applicable, e.g. Anaconda): 3.8.5 (Anaconda)
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): conda
• Relevant/affected Python packages and their versions: black 19.10b0
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version #3977): disabled
• Black arguments: "python.formatting.blackArgs": []

Expected behaviour

given a python file like this (with 2+ lines at the end of the file):

import numpy as np

def test():
    return 0

I would expect black to format it to a file like this:

import numpy as np


def test():
    return 0

instead all lines but two at the end of the file are being trimmed.

import numpy as np


def test():
    return 0

So not exactly what you would expect.

[hochreitercorpuls]

Probably related to this #11001

[karthiknadig]

The cause for this is same as #11001. closing as duplicate.