utf8::decode DID return an error. You just ignored it (didn't check for it).

use Encode qw( decode );

print("Using Encode::decode:\n");
eval {
   $s = "\320\245\320\260\321\207\320\260\321\202\321\203\321\200 "
      . "\320\241\321\203\320\263\321\217\320\275";
   $s = decode("UTF-8", $s);
   $s = decode("UTF-8", $s);
   1
} or print($@);

print("\n");

print("Using utf8::decode\n");
eval {
   $s = "\320\245\320\260\321\207\320\260\321\202\321\203\321\200 "
      . "\320\241\321\203\320\263\321\217\320\275";
   utf8::decode($s) or die("Not valid UTF-8");
   utf8::decode($s) or die("Not valid UTF-8");  # line 19
   1
} or print($@);
[download]

Using Encode::decode:
Cannot decode string with wide characters at .../Encode.pm line 174.

Using utf8::decode
Not valid UTF-8 at a.pl line 19.
[download]

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