I don't know if this is the new "right" behaviour mentioned in the changelog, but our rewrites stopped working after the upgrade to 1.8.1

I have an URL:
"http://mysite.com/css/main-responsive.v203.css"
Which should point to the file:
"/home/mysite/www/css/main-responsive.css"

The config, that works on 1.8.0 and not on 1.8.1 (returns 404) is this:

server {

listen 80;

server_name mysite.cz;
root /home/mysite/www/;
expires 100d;

location ^~ / {
access_log off;

location /css/ {
alias /home/mysite/www/css/;

location ~ /(.*)\.v[0-9]+\.(css) {
add_header Cache-Control public;
try_files $uri $uri/ /$1.$2;
}

location /css/fonts/ {
add_header Access-Control-Allow-Origin *;
}
}

location /js/ {
alias /home/mysite/www/js/;

location ~ /(.*)\.v[0-9]+\.(js) {
add_header Cache-Control public;
try_files $uri $uri/ /$1.$2;
}
}

location ^~ /img/ {
..........
}

.......
}

Could you please tell me, how exactly did the rewriting change in the 1.8.1 release? Thank you

Removing the aliases makes it working on 1.8.0 and 1.8.1. It doesn't make sense to use them when the root is already defined.
It's just strange to introduce such a change in a "stable" release, this was the first time when nginx update stopped our website.