No, that's perfectly fine. I'd clean up the syntax and only dereference TEXT once. Also, you're misusing the '%' sigil. It changes depending on what you get back out - $ for scalars, @ for slices.

my $type = $MasterType{TEXT};
$type->{function}(
    $type->{command},
    $type->{linkedHeaders} );
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Added: Mr. Muskrat and bart noticed that I used $type and $text but really I should have said only $type. So I fixed it.