$k3 = %{$hashr->{ $k1 }->{ $k2 }};
is analogues to
$k=%hash
$k3 is not a hashref but the scalar-value of a hash
(... which produces something mostly useless like 1/8 indicating the memory use)
what you really want is either
$k3 = $hashr->{ $k1 }->{ $k2 };
to get the hashref
or
%h3 = %{$hashr->{ $k1 }->{ $k2 }};
to copy the nested sub-hash!
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