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use strict;
use warnings;
...

$hash{ 'a' }{ $label } = "newvalue";
print $hash{ 'b' }{ $label },"\n"; # is "newvalue" !!!

use strict;
...

$hash{ 'a' }{ $label } = "newvalue";
print $hash{ 'b' }{ $label },"\n"; # is "value" !!!