This works for me.

#!/usr/bin/perl

# https://perlmonks.org/?node_id=1231953

use strict;
use warnings;
use Tk;

my $mw = MainWindow->new;
$mw->geometry( '+300+300' );

my $button = $mw->Button(-text => 'Test',
  -command => sub { print "B1 released\n" },
  )->pack;

$button->bind('<ButtonRelease-1>' => sub { print "bind release\n" } );

MainLoop;
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