What makes you think the BEGIN treats %hash as if it were a file-scoped global? Try moving the my %hash; *after* the begin block.
Note also that your claim the keys are retained doesn't seem to be true:
use strict;
use warnings;
use 5.010;
sub routine {
my %hash;
BEGIN {
$hash{KEY} = "string";
}
$hash{FOO} = "something else";
say join " ", keys %hash;
}
routine; routine; routine;
__END__
Variable "%hash" will not stay shared at /tmp/hh line 12.
KEY FOO
FOO
FOO
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