No Christian Church decided to do anything with the Jewish text. The early Church used the Septuagint as their Hebrew Scriptures. This was used by the Jews of Egypt and other Greek speaking Jewish communities.The NT canon in all Christian denominations contains the exact same number of books.
The Hebrew Bible (OT) contains the exact same content as the 39 books we have today as the OT. This is true for all denominations as well.
The "odd" part is the Jewish text which both the Jews and the Protestants reject (and so also did Jerome reject) as canonical scripture. "Some" Christian groups take those Jewish texts and decide to make them part of scripture "anyway".
The Jews of Israel used the Hebrew texts but there was no Canon until Circe 125 AD.
As for Jerome, he is just a translator with no authority so it is just an opinion.
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