Yes, you're right. version should die. However, I also realized two problems. One, some modules don't have versions (shame on them) or they get released without a version upgrade (this is common when you have a distribution where only the main module's version changes). As a result, what I should really do is this:

$override->verify(
    module => 'Broken::Module',
    verify => \&verification_callback,
    fatal  => $boolean_value,           # defaults to true
);
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