Jerome's Latin Vulgate Exposed: Jerome's Latin Vulgate is a bad source text, and even Jerome admits he revised copies of the Old Latin Bible Vulgate/Old Latin Bible Version that saved people who also spoke Latin used, & Jerome admitted that Christians have branded him to be a forger/falsifer of the Scriptures and of making corrupt Scriptures.

Even though Jerome's Latin Vulgate does have 1 John 2:23 (LINK) and does have Mark 16:9-20 (LINK), which goes against the modern versions' unbiblical omissions and doubts of Mark 16:9-20, there are corruptions and errors in Jerome's Latin Vulgate of 405 AD (LINK).
"St. Jerome's Preface to the Vulgate Version of the New Testament
Addressed to Pope Damasus, A.D. 383.
You urge me to revise the old Latin version, and, as it were, to sit in judgment on the copies of the Scriptures which are now scattered throughout the whole world; and, inasmuch as they differ from one another, you would have me decide which of them agree with the Greek original. The labour is one of love, but at the same time both perilous and presumptuous; for in judging others I must be content to be judged by all; and how can I dare to change the language of the world in its hoary old age, and carry it back to the early days of its infancy? Is there a man, learned or unlearned, who will not, when he takes the volume into his hands, and perceives that what he reads does not suit his settled tastes, break out immediately into violent language, and call me a forger and a profane person for having the audacity to add anything to the ancient books, or to make any changes or corrections therein?"
From the website of Jerome's Latin Vulgate https://vulgate.org

In the 300sAD, a Christian scholar in northern Italy named Helvidius accused Jerome of using corrupt Greek manuscripts for his Latin Vulgate as per Jerome's own book called Against Helvidius. The only way for Helvidus to say that Jerome used corrupt Greek manuscripts, and Jerome never refuted that above claimof Helvdius, is because Helvidius had a pure form of Greek manuscripts and that Jerome had and used both corrupt, and not-corrupt, types of Greek manuscripts

In the late 300s (before Jerome moved to Bethelehem in the Middle East to make his Latin Vulgate), Jerome, for some years, lived in Rome. Helvidus lived in northern Italy, and Helvidus wrote a letter to Jerome, and Jerome replied back in his own Against Helvidius.

Jerome himself said in his Latin Vulgate preface revised the Latin with his own revisions, instead of just translating what the Greek said into Latin. The Lettee of Heisalso have Jerome's own "Epistle of Jerome to Pope Damasus" where Jerome says what I just mentioned.