Why are build files created in ~/.cache/yay as well as /var/cache/private/yay?

[kiecla]

Affected Version

yay v12.4.2 - libalpm v15.0.0

Describe the bug

There are build files in both ~/.cache/yay and /var/cache/private/yay. They are the same files.

Reproduction Steps

1. Use yay.
2. Look in ~/.cache/yay
3. Look in /var/cache/private/yay
4. Files present when checked.

Expected behavior

Build files in one directory or the other, but not both.

Output

sudo ls /var/cache/private/yay
# displays folders for a few package I have installed, containing build files.
# sudo is required due to permission denied otherwise.