The Hanafis require makeup once a begun voluntary prayer is invalidated, because commencement makes completion binding.
Al-Shafi‘i does not impose makeup, reasoning that the original voluntary character is not automatically transformed into an obligation by beginning.
The disagreement is about what legal duty follows commencement, not about whether nafl prayer is recommended.
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Voluntary Prayers: Regular Sunnahs, Nawafil and Juristic Differences
The Hanafis require makeup once a begun voluntary prayer is invalidated, because commencement makes completion binding.
Al-Shafi‘i does not impose makeup, reasoning that the original voluntary character is not automatically transformed into an obligation by beginning.
The disagreement is about what legal duty follows commencement, not about whether nafl prayer is recommended.