Umask environment not being applied

I have set UMASK_SET=002 in my docker-compose.yaml file for my family of containers. If I log onto the console of the container as either root or abc and run umask it returns 0022.

Does the UMASK_SET env work?
( I started investigating when I noticed files being created without group write being set)

if the readme says it’s supported it should be.
you haven’t provided much detail here though.