prebuild not executed during Upload Using Programmer

[manuelmaurer]

In my arduino.json I have configured a script to install some libraries prior to compiling:

{
    "sketch": "Test.ino",
    "board": "arduino:avr:nano",
    "configuration": "cpu=atmega328",
    "output": "./build",
    "programmer": "AVRISP mkII",
    "port": "COM1",
    "prebuild": "..\\install.bat"
}

This works fine with the standard Verify and Upload commands.
However, using an Programmer (AVRISP mk2 in my case) the script is not called.

Expectation:

[Starting] Verify sketch - Test.ino
Run prebuild command: ..\install.bat
[INSTALL] Running Installer...
[INSTALL] Done
Please see the build logs in Output path: c:\Programming\Test\build
Set log4j store directory C:\Users\user\AppData\Local\Arduino15
Loading configuration...
Initializing packages...
Preparing boards...
Verifying...

Actual:

[Starting] Upload sketch - Test.ino
Please see the build logs in Output path: c:\Programming\Test\build
Set log4j store directory C:\Users\user\AppData\Local\Arduino15
Loading configuration...
Initializing packages...
Preparing boards...
Verifying...

Running vscode 1.40.2 with Arduino 0.2.28