Yes though increase in diversity brings higher demand for authority because it seems to be the only thing that can bring order. Some would call Singapore "authoritarian" (how compatible is it with "Democracy" of the West? Or post-Imperial Japan for that matter -- the main topic here). They invest energy into micromanaging it.[1]
There was a lot of racial tension[2] in Singapore before Lee Kuan Yew straightened them out. Mandates on what languages to use for what ethnicities, with English being the main language, seems to have worked.
As well as a racial quota system to prevent natural self-sorting into ethnic groups, and to enforce integration.
"To prevent conflicts and ethnic isolation (Singapore is the safest city in the world according to Gallup) ethnic quotas are mandatory.The distribution of public housing is carried out based on these quotas and it is impossible to find a block of apartments in which the percentage of Chinese, Indians and Malay people gives preference to one of the groups (with regard to the country’s population). And since the construction and ownership of the property are strictly regulated, given the lack of space on the island, it is extremely hard to escape the system. These quotas are also applied within the administration itself, in businesses and even in some activities such as leisure.To date, the system has been a success that has almost prevented any sign of segregation. However, the model depends on a system of surveillance, punishment and repression, which feels somewhat Orwellian, but without which, its implementation would not be feasible. This is, paradoxically, a society that voluntarily relinquishes certain freedoms related to the way in which citizens interact with one another, in order to guarantee their coexistence."[3]
[1]https://www.asianews.it/news-en/Ethnic-and-religious-violenc...
[2]https://en.wikipedia.org/wiki/1964_race_riots_in_Singapore
[3]https://tomorrow.city/a/forced-integration-plan-singapore