Did any immigrant enclaves disappear due to return migration rather than assimilation

[Capsicum]

Many ethnic enclaves (in the US and elsewhere) disappeared due to assimilation into the wider population. Leaving the enclave or having kids of the next generation join the wider society. Some disappeared due to being bulldozed by urban renewal but whose former residents still live in the country.

Are there any enclaves where many of its residents packed up after some time and a large share of whose descendants now reside in the "old country"? Closest I could think of is maybe some temporary Chinatowns in the west driven out in the Gold rush/then Chinese exclusion act days (but many moved to big city Chinatowns still stateside, while others returned to China).

I'd imagine it's rare since even in an enclave, the goal of buying property, having kids cements one into staying long term, but we know there were many cases of high return rates for some immigrant groups for economic migrants like Italians.