Even if it was possible to do what you want with HTML::Entities — and it looks like you can't — It would make most sense to just use
$mystring =~ s/;/;/g;
$mystring =~ s/&/&/g;
That said, decoding "&" without decoding all other entities creates garbage. For example
é
and
é
are clearly not equivalent, but they produce the same string under your requirements.
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