Thanks!
I probably end up having same version in all modules.
Immediately after I released "release" CPAN version of my script (previously I had "unzip-and-run" version), one of my users messed up files somehow of old and new version.
Thus I add version to all files (that solved all of problems in original post, btw), and wrote code like this to check version runtime:

    for (keys %INC) {
        if (/^App\/MtAws\/(.*)\.pmc?$/) {
            my $module = "App::MtAws::$1";
            my $got = $module->VERSION;
            $got = 'undef' unless defined $got;
            die "FATAL: wrong version of $module, expected $VERSION, f
+ound $got" unless $got eq $VERSION;
        }
    };
}
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