Heh, probably those centuries of isoloation.
All over the world groups of peoples are holding onto age-old traditions and customs that earmark them as very possibly being descended from the tribes of Israel.
In this episode we see even among the Taliban there are Hebrews who know to keep the Torah over and above the Quran.
A Timeline documentary conducted by Professor Simcha JacoboviciQuest for the lost tribes of Israel Pashtuns / Pathans | April 19, 2020 | Ahavah Fellowship
Yitzhak Ben Tzvi, the second President of Israel and a distinguished historian, did a study of these isolated communities, some of whom are now taking an active part in modern Israeli life; i.e., the Bnei Menashe who came from Northeastern India, have oriental features, and meticulously keep some complex Torah precepts, and the Ethiopians, who are black, but in a lighter tone than other, non-Jewish Africans. They claim descent from the tribe of Dan, and do keep quite a few halachas and have peculiar customs of their own, entirely in keeping with Torah traditions. Others remain isolated, but I think Yitzhak ben Tzvi covers them all.