I'm building a Docker image using Yarn 3 and I've noticed that on that image it creates two cache folders:
.yarn/cache
.yarn/berry/cache
Both appears to contain the same content (the .zip package files).
The first one, .yarn/cache, makes sense and is the same as what I have on my local machine, but the second, .yarn/berry/cache, doesn't. "Berry" appears to be the codename of Yarn 2+ but I can't find any information about why it would create such a duplicate directory.
Any idea what it's about?