conan: [bug] Short paths and cygwin

I apologize if this issue has already been raised before but I searched and couldnt find the exact same issue I am having.

The short version is that I am running on windows, inside a cygwin shell as is required by a third party vendor that we use for critical software (aka we cant change the directory structure of the code, the compilers or tools they are requiring). I am running into an issue in conan where when I build in cache via a conan create command, it errors out because it reaches the path limit on windows of 260 characters.

I have tried using the conan short paths variable in both my conanfile as well as setting the global configuration to use CONAN_USER_HOME_SHORT and CONAN_USE_ALWAYS_SHORT_PATHS but neither seem to be working.

My thoughts are that since I am running inside a cygwin shell, conan thinks the environment is unix and does not apply short path logic. Any ideas on how to try debug this?

Environment Details (include every applicable attribute)

• Operating System+version: Windows 10 + cygwin
• Conan version: 1.20.5
• Python version: 3.6

Steps to reproduce (Include if Applicable)

• Use cygwin
• Run conan create using short_paths = True, and a very long directory structure

Logs (Executed commands with output) (Include/Attach if Applicable)