I am unable to reproduce your reported problem. Here is my SSCCE:

#!/usr/bin/env perl
use strict;
use warnings;

package Foo;

use IO::All;

sub foo {
        my $text = 'bar';
        $text >> io ('/tmp/quux.txt');
}

package main;

Foo::foo ();
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It runs to completion without error or warning. With nothing further to go on I can only assume that the problem lies in the code you have not shown.