AFAICT from Bug #90480, I think PerlIO::gzip may not support this. I usually use the core modules IO::Compress::* and IO::Uncompress::*. Their objects can also be used like filehandles - this works for me:

use IO::Uncompress::Gunzip ();
my $in = IO::Uncompress::Gunzip->new('tst.gz', MultiStream=>1 )
    or die "$IO::Uncompress::Gunzip::GunzipError";
print while <$in>;
close $in;

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In reply to Re: PerlIO::gzip can't handle appended stuff by haukex
in thread PerlIO::gzip can't handle appended stuff by Skeeve

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