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my $html_tree = parse_html($line);
$html_tree->eof();      # This was missing too.
...
my $plain_text = HTML::FormatText->new()->format($html_tree);

$html_tree->delete();   # This was missing.

use Object::Destroyer;

...
$html_tree->eof();

my $plain_text = HTML::FormatText->new->format($html_tree);

use HMTL::TreeBuilder;

...
my $html_tree = HTML::TreeBuilder->new_from_content($line);
my $plain_text = $formatter->format($html_tree);
$html_tree->delete();

use HTML::TreeBuilder;
use Object::Destroyer;
...
      'delete'
   )
);