New answers tagged har-sinai
The origional Torah did in fact have מנצפ׳ך in both forms, but over the generations, their proper use was confused. People forgot which form went in the middle of a word and which at the end, whereupon the צופים, נביאי הדורות, reinstated their proper use. This is found in maseches Shabbos 104a, and Megila 2b.
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