Can't detect Python venv interpreter when open folder with VSCode

[riverscn]

Issue Type: Bug

0. python -m venv venv in a Python project folder.

1. Right click on a Python project folder which contians a venv folder, and open it with VSCode. (Or cd into the folder in command line, and "code ." to open it.)

2. Select Interpreter, can't see the one inside venv.
   

3. Exit VSCode.

4. Open VSCode directly, not from a folder. Can see the interpreter inside venv.
   

5. Repeat step 1, can't see venv again...
   

Extension version: 2021.6.944021595
VS Code version: Code 1.58.0 (2d23c42a936db1c7b3b06f918cde29561cc47cd6, 2021-07-08T06:54:55.083Z)
OS version: Windows_NT x64 10.0.19043
Restricted Mode: No

System Info

Item	Value
CPUs	AMD Ryzen 5 5600U with Radeon Graphics (12 x 2296)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.36GB (4.08GB free)
Process Argv	--crash-reporter-id e7b9cad6-281a-4005-8537-6ee2e9843f58
Screen Reader	no
VM	0%

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383cf:30185419
pythonvspyt678:30270856
pythonvspyt602:30300191
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492cf:30256860
pythonvspyt639:30300192
pythontb:30283811
pythonvspyt551cf:30311713
vspre833:30321513
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
vscorecescf:30322572
pythondataviewer:30285071
vscus158:30321503
pythonvsuse255:30335481
vscorehov:30309549
vscod805:30301674
pythonvspyt200cf:30331938
vscextlangct:30333562
binariesv615:30325510
vstea450:30335276
bridge0708:30335490

[karthiknadig]

Duplicate of #16613