Fantastic Beasts 3: Why Did Dumbledore Give Jacob a Wand?
Why Does Dumbledore Give Jacob a Wand in Fantastic Beasts 3? 6 Mind-Blowing Theories
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Maybe the wand is powerful, so Dumbledore gave it to Jacob because he didn't trust it in the hands of anyone else. One Redditor theorised that it's like the Elder Wand in a significant and or dangerous way, and "it was given to him because it's safe with a Muggle who can't use it."
There's no way of knowing which theory is correct (or if it's something else entirely!), but we'll find out once and for all when the movie premieres on 15 April, 2022.