This map tile in Vietnamese at zoom level 9 has not been updated in several months.
On April 26, I corrected the Vietnamese name of a major city in Vietnam from “Da Nang” to “Đà Nẵng”. Wikimedia Maps correctly updated tiles at z10 and above but not at z9 and below. Since T194787 , most zoom levels have since been updated, but for some reason z9 never got regenerated. This thread suggests T159977 might help, but @MSantos suggested that I open this task anyways to ensure that it gets fixed.