If something isn't concatenated, it bypasses the addition of an `mtime` as well, which can lead to stale versions of those assets remaining in cache: https://github.com/Automattic/nginx-http-concat/blob/2239f115f3da6d09c8660db65163a08e55d0348c/cssconcat.php#L107.
If something isn't concatenated, it bypasses the addition of an
mtimeas well, which can lead to stale versions of those assets remaining in cache:nginx-http-concat/cssconcat.php
Line 107 in 2239f11