Because that's what local does! It lets you temporarily re-use the name of a package variable declared elsewhere.
Consider this expanded example:
#!/usr/bin/perl
use strict;
use warnings;
package Foo;
our $x = "blah";
package Bar;
print $Foo::x, "\n";
{
local $Foo::x;
print $Foo::x, "\n";
$Foo::x = 42;
print $Foo::x, "\n";
}
print $Foo::x, "\n";
which outputs...
blah
Use of uninitialized value in print at loc.pl line 15.
42
blah
The first print shows the original value of $Foo::x, the second one throws an unitialized value warning because the localized version of $Foo::x has not been assigned a value. The third print gives 42 because we assigned that to the temporary $Foo::x, and the last one prints "blah" again, because the scope of the local has ended.
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